Archy5683commenteda year ago
So I've just come across this...(The green algae is pretty normal and not really harmful, but you're right, it is annoying and it does use up some oxygen. You just need to block the light to the medium. You can use something called Panda film for a commercial product, or something as simple as a piece of tin foil.)
Any idea if the brown spots are reversible?... Is it due to cal/mag deficiency or too much light intensity?...
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