Is it normal to have to dumo phosphate in your tank?
20 gallon long tank. Aiming for 20ppm nitrate and 5ppm phosphate.
I need to put in about 1/4 tsp of mono potassium phosphate into my tank 4-5 days a week to keep it at 5ppm. It drops like crazy overnight. It's almost always at 1ppm~ the next morning. This has caused two multi-week long algae blooms for me in the past. Each time I turn up my light, my phosphate intake increase at what seems like an exponential rate. So yeah, I've been finding out what the tank needs after light intensity increases the hard way. Hint: it's phosphate.
I have no issue keeping my nitrates around 20-40ppm just from what I assume is the fish bioload alone. I have to dose potassium nitrate MAYBE once a week at best. Some weeks I have to do extra water changes just to get it down. Because of this, I dose a decent amount of potassium sulfate as well.
Is this normal? I always hear people who don't know what they're doing saying dosing phosphate causes algae. I can definitely say that the LACK of phosphate with a high-ish nitrate is what causes algae, all other parameters being at the correct level.
Last edited by Ddrizzle; 03-31-2019 at 10:31 PM.