Sump on reef?

[Tigerbarb]

I googled the african flameback, and it looks great. Flameback it is.

[unleashed]

I had never thought about how a sump would increase water volume. Looks like I will be adding a 10-20g sump to my 20, getting more live rock, and adding more fish.

Just because you are increasing the water volume for the total system, doesn't mean you are increasing the swimming room. I would never add a dwarf angel to any 20g tank, unless, like gold barb stated, the flame back. However, I still do not think that it is fair to place such an active fish in a tank less than 30g

[Tigerbarb]

I agree, and my tomato clown will soon outgrow my tank. If I somehow do get the flameback, I'd want atleast 50 lbs of rock.(atleast 20 lbs tufa rock)