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how much prime to use during water change
I do weekly 2540% water changes on a 20 and 10 gallon. when I am adding prime to the water prior to adding it to the tank, how much should I add. I am using a 3 gallon bucket to do the changes, do I add it based on the amount of gallons in the bucket or in the tank itself??
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Banned
I've do it two different ways. After draining with a Python, I add the amount of Prime for the whole aquarium and then add my water. I may be able to get by with less Prime, but this works for me. I'm amazed at how fast Prime really works.
When I use buckets, pitchers, etc. I add two drops per gallon from a 50 mL Prime bottle that has a flip up cap made to dispense drops. When the bottle gets empty, I refill it.
When I use buckets, pitchers, etc. I add two drops per gallon from a 50 mL Prime bottle that has a flip up cap made to dispense drops. When the bottle gets empty, I refill it.
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Last edited by Left C; 06112009 at 11:12 AM.
Planted Tank Enthusiast
okay well I dont have a drop dispenser thing so um, how full should I fill the cap on the 250ml lol


Wannabe Guru
Quote:
Originally Posted by Left C
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I've do it two different ways. After draining with a Python, I add the amount of Prime for the whole aquarium and then add my water. I may be able to get by with less Prime, but this works for me. I'm amazed at how fast Prime really works.
I'd do about 1/2 capful for your 20 gal and 1/4 capful for your 10 gal.

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Planted Tank Enthusiast
okay cool and that is total right, not per bucket of water I use?
Planted Tank Obsessed
Quote:
Originally Posted by Left C
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I've do it two different ways. After draining with a Python, I add the amount of Prime for the whole aquarium and then add my water. I may be able to get by with less Prime, but this works for me. I'm amazed at how fast Prime really works.
When I use buckets, pictures, etc. I add two drops per gallon from a 50 mL Prime bottle that has a flip up cap made to dispense drops. When the bottle gets empty, I refill it.
When I use buckets, pictures, etc. I add two drops per gallon from a 50 mL Prime bottle that has a flip up cap made to dispense drops. When the bottle gets empty, I refill it.
I just prime what I add back. Like if I add 10 gallons of water back I add 1ml of prime. should I be adding more?
Banned
Quote:
Originally Posted by belladee
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Wait.. so you add the amount required for the whole tank? So if you have a 70gallon tank and add back 10 gallons, you add enough for 70 gallons?
I just prime what I add back. Like if I add 10 gallons of water back I add 1ml of prime. should I be adding more?
I just prime what I add back. Like if I add 10 gallons of water back I add 1ml of prime. should I be adding more?
From: http://www.seachem.com/Products/prod...ges/Prime.html This is also written on the 100, 250 and 500 mL bottles of Prime.
"Directions: Use 1 capful (5 mL) for each 200 L (50 gallons*) of new water. ... For smaller doses, please note each cap thread is approx. 1 mL. May be added to aquarium directly, but better if added to new water first. If adding directly to aquarium, base dose on aquarium volume. ..."
Do you see that they mention two different ways to add Prime?
Also, the threads in the cap extend about half of the way up. 1 thread is 1 mL which is enough to add to 10g of water. 1 thread is about 20 drops from the 50 mL bottle.
Most of the time when I top up an aquarium, I use a pitcher or bucket to hold my tap water. I add the amount of Prime for the pitcher or bucket by the drops. When I do large water changes with my Python, this is when I add enough Prime to treat the whole aquarium.
I really like those little 50 mL bottles and just squirt out 2 drops per gallon. It is easier than trying to measure out 1 mL by the threads. You can get them at Pet Smart.
When I do my large water changes, that is when I dose an whole aquarium's worth of Prime.
Something that isn't mentioned is how much Prime is too much. Like, what is the LD50 for Prime? I don't know. That is why I use two different methods. I know that at times I double dosed Prime and I didn't have any problems at all.
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Banned
Quote:
Originally Posted by Phish
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okay cool and that is total right, not per bucket of water I use?
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Planted Tank Guru
I always dose Prime for the total aquarium volume, and add it as I start refilling after a 50% change. My reasoning is that Seachem believes it takes a minimum concentration of Prime in the water to make it effective, however much chlorine or chloramine is in that water. I think this may actually be true, because obviously there could be a pretty big variation in how much is in the tap water, but they specify a single dosage amount, without concern for how much is in the tap water. I recall reading a forum response from Seachem where they said not to be concerned about overdosing as long as you are close to the bottle instruction amount.
Hoppy
Planted Tank Obsessed
Oh for goodness sakes... i am a complete idiot. All this time i have been carrying buckets for a 150 gallon tank, 4 gallons at a time and pouring because I was afraid to add the prime first. LOL My life just got a whole bunch easier... time to break out the python.
Planted Tank Obsessed
I called the company that makes prime.
they said just dose the water you are adding, not the volume of the tank. You can dose the column of the tank but it is not necessary and they said you can add it before, during or after just do it at the time of the water change.
Editing one month later: I now see on their own site they say if you are adding the water to the tank directly dose according to tank volume! So the lady I talked to was mistaken...or we had a misunderstanding
they said just dose the water you are adding, not the volume of the tank. You can dose the column of the tank but it is not necessary and they said you can add it before, during or after just do it at the time of the water change.
Editing one month later: I now see on their own site they say if you are adding the water to the tank directly dose according to tank volume! So the lady I talked to was mistaken...or we had a misunderstanding
Last edited by belladee; 07222009 at 12:47 PM. Reason: update
Planted Tank Obsessed
Quote:
Originally Posted by Phish
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okay well I dont have a drop dispenser thing so um, how full should I fill the cap on the 250ml lol
Quote:
Originally Posted by Left C
View Post
Most of the time when I top up an aquarium, I use a pitcher or bucket to hold my tap water. I add the amount of Prime for the pitcher or bucket by the drops. When I do large water changes with my Python, this is when I add enough Prime to treat the whole aquarium.
I really like those little 50 mL bottles and just squirt out 2 drops per gallon. It is easier than trying to measure out 1 mL by the threads. You can get them at Pet Smart.
When I do my large water changes, that is when I dose an whole aquarium's worth of Prime.
I really like those little 50 mL bottles and just squirt out 2 drops per gallon. It is easier than trying to measure out 1 mL by the threads. You can get them at Pet Smart.
When I do my large water changes, that is when I dose an whole aquarium's worth of Prime.
Quote:
Originally Posted by Left C
View Post
Something that isn't mentioned is how much Prime is too much. Like, what is the LD50 for Prime? I don't know.
Quote:
Originally Posted by Hoppy
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I recall reading a forum response from Seachem where they said not to be concerned about overdosing as long as you are close to the bottle instruction amount.
Seachem has a subforum on the other planted aquarium website. Here is where the discussion ran about overdosing Prime:
http://www.aquaticplantcentral.com/f...overdose.html
Hoppy, you actually posted during this discussion!
Quote:
Originally Posted by belladee
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I called the company that makes prime.
they said just dose the water you are adding, not the volume of the tank. You can dose the colume of the tank but it is not necessary and they said you can add it before, during or after just do it at the time of the water change.
they said just dose the water you are adding, not the volume of the tank. You can dose the colume of the tank but it is not necessary and they said you can add it before, during or after just do it at the time of the water change.
Planted Tank Guru
This question comes up very often. And, that's because the logic involved isn't very clear. What is clear is that Prime doesn't have to be dosed extremely accurately in order to not harm the fish/shrimp. Seachem clearly said that 5 times the recommended dosage is as high as you should ever go, but following the 1 ml per 10 gallon recommended dosage is the best way to do it. I think LeftC had the best answer  either dose the container of change water at 1 ml per 10 gallons before adding it to the tank, or dose the partly filled tank at the 1 ml per 10 gallons full tank capacity as you refill the tank. If you are doing a 50% water change you will be initially dosing the tank at twice the recommended dosage, which Seachem clearly said is not going to do any harm. But, if it is an 80% water change, then dosing the tank as you add the change water would put you at a 5X dosage initially, which might be iffy. The obvious fix for that is to dose half the Prime initially, then dose the second half as the tank gets closer to being full. And, dosing nano tanks requires nano dosing techniques.
Hoppy
Planted Tank Obsessed
Quote:
Originally Posted by Hoppy
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 either dose the container of change water at 1 ml per 10 gallons before adding it to the tank, or dose the partly filled tank at the 1 ml per 10 gallons full tank capacity as you refill the tank.
Banned
Quote:
Originally Posted by belladee
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I just dont get this. I want to understand... If you take 10 gallons out of a 70 gallon tank and then add back 10 gallons to the tank directly (with a python) WHY not just dose the 1ml? WHY dose 7ml? Why retreat the rest of the tank water?
I knew a breader that used to not treat his water at all. He had everything you can thing of, Angels, Discus, Africans, GBRsall kinds of fish of varying types. He used to do 90% water changes on every tank, thousands of gallons every day, and Prime was cost prohibitive.
Today, I does Prime for what I remove. It doesn't make sense to me to do anything else, unless you have more money than you know what to do with. If that's the case, let me tell you about a charity I have been working with. It's called the Human Fund. Write me a check, and I will see that it is put to good use.
A lot of it is determined by how much of what there is in your water, and it's an expensive and possibly cruel experiment, which is why with my current tank, in a new area, I use Prime.
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