scum

  1. K

    Air stone, wave maker or skimmer

    Hi guys - I have a tetra 54ltr tank and a 30ltr biorb. Both fully cycled and have fish in. The rectangular tank doesn’t seem to have a great amount of surface agitation and I have noticed a small amount of scum on the top-should I get a power head of some sort or wave maker or skimmer? Any help...
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