Adding Flourish Comp In Top-off Water? - The Planted Tank Forum
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post #1 of 8 (permalink) Old 12-04-2015, 03:47 AM Thread Starter
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Lightbulb Adding Flourish Comp In Top-off Water?

I keep 1 gallon of water for top off already dosed with 0.1mL of Prime, I tend to go through a lot from evaporation about a gallon a week. Would anyone recommend adding a skimp 0.1mL of Flourish into the top-off water? I figured a slow trickle cant hurt since I don't use the full tank capacity dose anyway on water changes/weekly.

Prime is 5mL per 50 gallons, which is 1mL per 10 gallons (0.1mL per gallon).

Flourish is 5mL per 60 gallons, which is 1.25mL per 15 gallons (0.4mL per 5 gallons) so even a full 0.1mL per gallon I cant see being harmful in a top-off dosing.
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post #2 of 8 (permalink) Old 12-04-2015, 09:49 AM
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How long does your top off water sit around for before use?

Micros don't have a very long life once they hit the water.. Maybe 2-3 days max for some micro elements.

If there's any PO4 present in the water you will also get some precipitation of Fe, meaning that some of your Fe will become unavailable to the plants. If you lengthen the time of exposure to a few days, this process makes more and more Fe unavailable.
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post #3 of 8 (permalink) Old 12-04-2015, 05:03 PM Thread Starter
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It takes a week to consume the gallon so in your theory, this may be pointless. I appreciate the info!
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post #4 of 8 (permalink) Old 12-05-2015, 01:26 AM
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It's not pointless if you add NPK instead of micros to the top up water. The macros we use are available to plants for much longer than traces once they hit the water.
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post #5 of 8 (permalink) Old 12-05-2015, 01:44 AM Thread Starter
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Yeah that would be Flourish? Which is an NPK?
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post #6 of 8 (permalink) Old 12-05-2015, 01:48 AM
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Flourish comp has a small amount of N + P but no K. I think it's designed for low tech low light where fish food/excretion add most of the N and P content. Strangely K is probably the most necessary addition for low light as none is added by fish food and it's required to balance N + P.

You're still in the same situation though as some of the micros in Flourish comp will become ineffective over time after adding to water...

Edit: Sorry Diana, I edited my post at the same time you posted and accidentally included some similar info.
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Last edited by Straight shooter; 12-05-2015 at 02:19 AM. Reason: Info
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post #7 of 8 (permalink) Old 12-05-2015, 02:07 AM
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Seachem bottles N, P and K in separate bottles so you can customize the dosage for your tank.

If your tank is more of a low tech tank, with moderate light, no additional carbon (CO2, Excel) then fish food might supply enough of most nutrients.
Fish food is high in N, P and most traces. If the NO3 tests show that the fish food is supplying enough nitrogen, then it is also supplying enough phosphorus and most trace minerals.

Fish food is low in potassium, iron, calcium and magnesium.
If you are relying on fish food for fertilizer, then the first elements to supplement will be potassium (Seachem Flourish Potassium) and Iron (Seachem Flourish Iron).
Water changes will usually supply enough Ca and Mg, as long as the GH of the water is at least 3 German degrees of hardness.

If your tank is mostly fertilized with fish food, then I would not supplement with Seachem Flourish Comprehensive. I would target the minerals in short supply.

I would not mix this with water that is left standing around for a week.
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post #8 of 8 (permalink) Old 12-05-2015, 04:20 AM Thread Starter
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Thanks, I keep Osmocote in a misting bottle for fertilizing my terrestrial mosses, I wanted to use Flourish instead but sounds like Osmocote may be the better product for that.

Ohh NPK; #-#-# the "big 3" now I understand what you are referring to. I was just relying on what was in Flourish plus nitrates from my bacteria cycle. I do use Excel daily, and Prime/Flourish weekly. My lighting is moderate-low. The plants are all low-tech so it did not "seem" to need more N,P, or K. The only tank I think lacks something is my native tank with pond lily's and watershield they just do not stretch, they rapidly throw shoots and they melt before stretching (maybe iron?)

Also while we are on this subject, if Flourish Comp. only lasts about 3 days in the tank and I decide to do a midweek water change there is no point is adding more at that time if I am on a weekly dosing schedule since it will all be eaten up by the time I do a midweek water change anyway right??

Last edited by Darkblade48; 12-06-2015 at 04:43 AM. Reason: Please use the edit function for back to back posts to keep threads cleaner
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