04-16-2008, 06:05 PM
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Firefish may get spooked very easily in a 10G tank. If you decide to go that way, a hood is a must.
There are many type of Gobies that can be fit in there. You could fit two or three Green Banded Gobies, two Clown Gobies of any color variety (I like yellow, Citrine and Green), other Watchman Gobies, Neon-Blue Goby... there are a lot.
Most Cardinal fish cannot fit in a 10G. There are some dwarf species, but I personally think they are less attractive as some you can fit in a 20-30+.