I dose tlf acropower on my old tank (bought 1 gal) when it was ulns and I think it kept everything alive when I started starving everything. I have since moved and have higher nutrients now but I kept the doser running since, then so far idk if it does anything.
Noted that I did have some cyano blooms when I was dosing a lot and backed off but it could have been the new sand.
Summary: I dose. I keep using it because I don't want to change anything. So far so good.
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