is my 30 gal over crowed with fish

[flame cardinal]

i have a flame cardinal,1 blackfined shrimp goby,1 green brittle star,1 sea slug

 

[nasukan]

If you do it slowly you could squeeze at least two meduim sized fish in there. A dwarf angel, a hawkfish, a six-line wrasse, or a pair of percs would do fine. You may have to watch the hawk to make sure he doesn't bother the goby. Some hawks bother bottom dwellers.

 

[here fishy]

A school of firefish would work too!

 

[blutang]

As far as being overcrowded.....if you introduce these fish in gradually you'll be fine