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How do I get rid of this algae? I have 2 10 K T5 HO metal halides as well as actinic. the whites are on from 6 Am to about 6 PM, and the blue are on at 6, and off at 6 pm. 20 gallon tall and lights are about 4 inches above the top of the glass evap. I have a skimmer, don't over feed and...

I have this in my aquarium but it's not looking too good right now, and nowhere near as beautiful as it once was when this picture was taken. Can you identify this for me so I can research to find out what may be causing it to b closed all the time and one of the centers is almost completely...

I bought her from a LFS about 2 months ago, petty aggressive at first, but has chilled and love my true perfula.

I have two new corals that I don't know the names of. The receipt says dragonfly coral but I can't find it online under this name, the second is named a slate coral. Can anyone help me identify these two so I can feed them properly?

Hey all! I'm just getting started in the aquarium world, but I have a 20 gallon freshwater going with a figure 8 puffer, a ghost knife, a cory catfish, and a few tetra's. Testing my water and so far all is well but learning how to keep the ammonia down is hard. My ghost knife doesn't like...