Komerider is right: if your tank’s parameters are conducive for algae, they will grow as time goes by.
however, I do not see any downside in using a soft brush to lightly remove the algae if that gives you peace of mind
certainly no need to get rid of the frag.....
Er.. if ur tank is meant to get that algae it'll just appear. Doesn't matter if it's seeded or not. If it's not conducive for algae growth it'll just die. That's my opinion.
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