Water level after 25% on 90 Gallon - The Planted Tank Forum
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post #1 of 23 (permalink) Old 12-11-2013, 12:23 PM Thread Starter
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Water level after 25% on 90 Gallon

I am working on some planning as I am building something and I don't have the tank here yet to actually take the measurement. Does anyone have an idea of how low from the top of the tank, preferably the bottom of the black trim the water line is after doing a 25% water change on a 90 Gallon? I understand this will all depend on where you keep your water level anyways but generally most I would think would keep it above the black trim anyways. Which is why if you had a measurement from the bottom of that it would be a little more accurate. If not that is no biggie. I am not looking for an exact measurement but if you have one that is even better. A rough estimate would work just as great too.

-Thanks


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post #2 of 23 (permalink) Old 12-11-2013, 12:34 PM
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Water level after 25% on 90 Gallon

Assuming you have the 48x18x24 90Gal tank and an average of like 3" substrate. That leaves about 48x18x21 or 18411cu in or 78Gal water + a little in the substrate.

25% of that is 19.5Gal so you'd have 58.78 gal left in the tank + some in the substrate, which would take up about 13608cu in.

Your width and length don't change, so that looks like about 15.75" of water in the tank+ 3" substrate and assuming the black trim is about an inch and a half, 3.75" from the bottom of the black trim.

Please keep in mind there's a lot of guesstimates in this due to the substrate.
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post #3 of 23 (permalink) Old 12-11-2013, 12:40 PM
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Tank height/4


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post #4 of 23 (permalink) Old 12-11-2013, 12:57 PM Thread Starter
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Yes sorry about that. It hit me I didn't add the dimensions and by the time I got back there was replies. Yes it is 48x18x24 and you math wiz's make my brain hurt...LoL

I had 22G after 25% but my math isn't good at all so that may not be correct. I didn't figure in the substrate to account for displacement so yeah that changes things a little. So we're looking at roughly 4" so I will make it 5" to be safe. It doesn't have to be actually 25% anyways, if it is a little more it won't hurt.

Thanks guys!


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post #5 of 23 (permalink) Old 12-11-2013, 02:18 PM
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Originally Posted by Texan78 View Post
Yes sorry about that. It hit me I didn't add the dimensions and by the time I got back there was replies. Yes it is 48x18x24 and you math wiz's make my brain hurt...LoL

I had 22G after 25% but my math isn't good at all so that may not be correct. I didn't figure in the substrate to account for displacement so yeah that changes things a little. So we're looking at roughly 4" so I will make it 5" to be safe. It doesn't have to be actually 25% anyways, if it is a little more it won't hurt.

Thanks guys!
Sounds good to me. Extra water in the substrate will probably be offset by any plants/fish/driftwood you have in the tank anyways since they'll all displace water also. So 4" should be about right, and 5 sounds good to me.
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post #6 of 23 (permalink) Old 12-11-2013, 03:57 PM
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it's not really something you need to worry about measuring.


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post #7 of 23 (permalink) Old 12-11-2013, 04:14 PM
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it's not really something you need to worry about measuring.
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post #8 of 23 (permalink) Old 12-11-2013, 04:29 PM
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You can just place a mark on the tank with sharpie somewhere where it is not easily seen to let you know when you have removed the amount you wish.
I find it easier to just remove 50% at water changes.
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post #9 of 23 (permalink) Old 12-11-2013, 06:27 PM
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We guess at the amount of water the tank holds, we guess how many plants and how much ferts they use, We guess at how much we feed so guessing at the correct amount to change just seems to be the only way to go. If there's a dead fish laying back in the corner out of sight, it throws the whole thing off anyway.
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post #10 of 23 (permalink) Old 12-11-2013, 09:30 PM Thread Starter
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You can just place a mark on the tank with sharpie somewhere where it is not easily seen to let you know when you have removed the amount you wish.
I find it easier to just remove 50% at water changes.

As I stated in my first post I don't have the tank here yet so I can't do that. I am trying to build something in preparation of receiving my tank to save time that requires hard plumbing. Since this has to be up by Christmas any time I can save the better.

It just seems like laziness to me to guess at something when it doesn't have to be guessed. Helps to eliminate things if you have problems later on.


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post #11 of 23 (permalink) Old 12-11-2013, 09:47 PM
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Someone has probably already stated, but w" x h" x d" = ... / 231 = gallons. So if you lower the height by 4" or 5" or 6" then just recalculate.
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post #12 of 23 (permalink) Old 12-11-2013, 11:03 PM
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It just seems like laziness to me to guess at something when it doesn't have to be guessed. Helps to eliminate things if you have problems later on.
so you just called a crapload of aquariasts, both professional and hobbiest level, lazy?


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post #13 of 23 (permalink) Old 12-12-2013, 12:01 AM Thread Starter
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so you just called a crapload of aquariasts, both professional and hobbiest level, lazy?

That's putting words in my mouth.


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post #14 of 23 (permalink) Old 12-12-2013, 12:22 AM
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That's putting words in my mouth.
it's not though. you said that it's lazy not to measure something that you can. which in this case means 25% volume for a water change. water changes are something a lot of people do.

there are thousands of folks on this forum, and others, who don't measure their water volume for water changes, and merely make a guess. thus, according to you, are being lazy.

you may not have meant to imply that, but it is what you said. I'm not taking offense, I'm just pointing out what you're implying.


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post #15 of 23 (permalink) Old 12-12-2013, 12:57 AM Thread Starter
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It just seems like laziness to me to guess at something when it doesn't have to be guessed.
Maybe that should read for me since it is being taken out of context especially when I can take a 5G homer bucket from HD that I already have and measure out 5 buckets and then look at the tank and make mental note.

Reason being is if WC are so important and they are needed to remove excess nutrients and you're having problems and someone asks well are you doing WC? Well how much? Aw maybe about 25% when it could actually be only 10% it throws off the entire balance of everything as you could be overdosing and not removing as much as you need to be removing. For me on a new tank until I know how it reacts I want to know every little aspect of that tank and keep records so I know if and when and where a problem might be until I am familiar with it. That just works for me. Sure, when you have an established tank and you know every little aspect of it then you can get away with guessing. For someone just getting started who has never kept a planted tank the right way I wouldn't recommend it as it is lazy when you can measure it out easily without no effort. For me I would rather not guess when I don't have to so I can keep record of it until I know how it is going to be. I know my reef tank from the back of my hand and can predict every little aspect of what it will do and wont do if I do this or don't do that to where I can guess and little things that needs to be done because I know it so well and I have been doing it forever. I want the same grasp of this tank as well as doing it this way just works for me. I am learning every little odd and end of planted tanks till it just because standard practice. IMO, I don't think that kind of dedication is a bad thing. I am not new to aquariums by any means. I have been keeping them for 25+ years to reef tanks, lake tanks, freshwater but, planted tanks is a whole other beast and something I have always wanted to do as I have kept them in the past but didn't do them "Properly" for numerous reasons. I have the opportunity to build planted tank and do it properly as I have always wanted and at the same time learning every aspect of how to keep one. If my methods are overkill then that is on me but that is what works for me and shouldn't be considered wrong. What works for some doesn't work for others and that's ok. Like a lot of people, I have a very hefty chunk invested into this hobby and for the amount I have dumped into it and not see results my wife would have my head. So I am just trying to do everything by the book at first until I can trust myself with just doing things by guessing like I have with my other tanks which are pristine.


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