i'm 8 weeks into a salt tank and the brown algae has been here for a good 3 weeks, i clean it daily with a tank magnet for the glass and blow off the substrate and rock with a turkey baster, tank looks like death for a couple hours and then the filters catch up.......start all over the nest day.....this is the last step in the nasties . .nice green algae will come next and then the purple stuff, i do a 20% water change every week and clean one filter every week then the other the next week . . . . your doing fine, just keep cleaning and stay patient

I think you are about to finish the nitrogen cycle. Brown algaes will dissapear just as fast as they came. I know it's kinda' disgusting, but heads up it'll go away. Do a good 20 % water change when the cycle's done, and introduce a lawnmover blennie to your tank. They're love those disgusting brown algaes. Sometimes they clean a whole rock right front of your eyes...Pretty cool.

nah buddy i dont think so. u kno u got 4 already in a 20g that might be pushing it. so just settle for those 4 and make sure they are compatible since u dont got much room for them to swim in so they wont try and make each other sushi.