The algae easily wipes off, I do it all the time with a sponge made for that. I use Thrive, 1 dose of .50ml once per week.
The a reneckii is now gone so I'll be only feeding the ludwigia, a few val and the java fern for now. I plan on adding more plants once I decide what to do in there. I'm against the nerite because I have the puffer who is aggressive towards snails.
I'll get my KH and GH numbers later today.
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