In my 55 gal aquarium, I am getting this green type algae covering my sand and shells. This tank hold 7 Noelamprologus Similis, with about 50 shells in tank. I noticed the green stuff covering a corner of the aquarium and slowly creeping across aquarium. I cover the sand up to try and smother it out, I did a black out for 4 days, even treated tank with algae clean out product.... Kind lost at this point on how to rid any suggestions will be greatly appreciated....
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