I used:Sponge Power
Coral Vitalizer
Pohls Extra
Coral Snow
My water was very clear and I had a lot more sponges. I did notice that the day after every dose of Pohls Extra I would get a tiny spot of red cyano show up. I have not used Zeovit for a few years now other than Coral Snow when I remember. Which is maybe 1 or 2 times a month. I think Zeovit products are too expensive for me to use and I'm not a "struggling student".
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