Monopotassium Phosphate (GSA) question? - The Planted Tank Forum
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post #1 of 5 (permalink) Old 08-26-2018, 12:38 AM Thread Starter
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Monopotassium Phosphate (GSA) question?

Iím planning on purchasing some kh2po4 from Greenleaf Aquariums to help battle my on going Green Spot Algae problem. My questions are:

Can I add the powder straight to my aquarium?
How much do I add for a 75 gallon?
How often do I add?

I already dose Easy Green All in One once a week. About 8 squirts. And I do about a 50% water change once a week.

I have nitrate snails and they arenít doing the greatest job. I canít afford CO2 right now. Excel doesnít do crap to help it either. The stuff is all over my plants.


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post #2 of 5 (permalink) Old 08-26-2018, 01:01 AM
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Your plants have algae because they arent happy. Adding PO4 might help but probably not unless P is currently what they are unhappy about.

I believe those GLA bags come with dosing amounts for EI, in teaspoons. Its on the label iirc. You should be fine adding one or two EI doses per week.

Alternatively you could double up the all in one fert and see if that helps. If more nutrients overall doesnt help, not then the plants are most likely starving for CO2. If that is the case you could try lowering the intensity of your light. This may or may not make the plants happy but its worth a try.

Here again, the reason your plants have algae, gsa or otherwise, is because they arent entirely happy. Look for reasons why that is and the algae will take care of itself.

EDIT: 1/8 tsp KH2PO4 once or twice a week. And yes you can dump it straight into the tank. Id do one right after the water change then another one mid week. Or you could do both at once, at least to begin with to see if it helps


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post #3 of 5 (permalink) Old 08-26-2018, 06:11 PM
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Hi

You can dump it in the tank but I prefer to just mix it in a jar of tank water.

Have you tested for PO4 levels in your tank? Are they low? Maybe the problem is too high light? Too high a light and no CO2 often = all sorts of algae problems.

Cheers
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post #4 of 5 (permalink) Old 08-27-2018, 02:45 AM Thread Starter
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Quote:
Originally Posted by Frank158 View Post
Hi



You can dump it in the tank but I prefer to just mix it in a jar of tank water.



Have you tested for PO4 levels in your tank? Are they low? Maybe the problem is too high light? Too high a light and no CO2 often = all sorts of algae problems.



Cheers


No, Iíve been meaning to purchase a PO4 kits. But nobody in my area sells them. I just need to get it online. Chances are itís my light. Iím running the Fluval Planted 3.0 in high for about 6 hours and and extra 2 for the ramp time. Iím hoping to get a CO2 kit by next year.


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post #5 of 5 (permalink) Old 08-27-2018, 06:30 PM
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Originally Posted by ricktfoster View Post
No, Iíve been meaning to purchase a PO4 kits. But nobody in my area sells them. I just need to get it online. Chances are itís my light. Iím running the Fluval Planted 3.0 in high for about 6 hours and and extra 2 for the ramp time. Iím hoping to get a CO2 kit by next year.


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In my opinion, without CO2, the first thing you should do is figure out how much light your fixture is providing. I don't happen to know much about LED lights, but maybe someone can chime in and estimate a PAR value for you.

Once you have a better idea of your light levels, it should help drive every other decision you make. And it may turn out that fine tuning ferts might not be your problem at all.

If the PAR is Med/High, and you are dosing ferts, then the plants may be starving for CO2.

In general, high light + high ferts - CO2 = algae farm.

There is also a world of difference between pleasing low light plants and fast growing stems. No mention in your post. Are we talking Anubias/Swords or stems? A picture of your tank and more information will probably help you get better advice.

And in general, I'm sure you are aware that you will have lots more options and everything will change when you add CO2.

Good luck and look forward to seeing where you go from here.
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