What size tank is it? I don't know of too many fish that can live comfortably in 6 inches of water aside from maybe guppies or something. You're also probably going to need a fish tank heater to keep the water the right temperature. (5 watts per gallon)Maybe you could get away with an axolotl (a small one, and with an adult gecko) in there, but figure out some way that the geckos cant fall in, or better yet, have no access to the water. Most geckos' toepads dont work well when the glass is wet. Trying to think of other fish that might work (I did tropical fish before I ever got into reptiles)--worked in an aquarium store for 3 years! Maybe serpae tetras. Theyre cheap and if you get a bunch they'll school. hardy too. Also, be aware that once you set up the aquatic portion your going to have to get it biologically viable for fish. Put one hardy fish in, which you muight lose anyway--and he'll introduce your beneficial bacteria. Wait 3 to 6 weeks, before adding any more fish, do not change the water and do not touch the filter. You need to have bacteria growing in there that can break down the fish's ammonia into less toxic chemicals and it just takes that long for them to get a foothold.

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