04-06-2010, 05:58 PM
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Welcome to Tropical Fish Keeping.
I'm afraid you have, or certainly will have, some issues in your 10g with the present fish.
My advice is to remove the redtail shark; perhaps the store will do an exchange or credit. This fish attains 6 inches and can be very aggressive to other fish as it matures. Recommended tank size is at least 30 gallons. This is not a suitable fish in a 10g aquarium.
I would also not recommend two male dwarf cichlids in anything under a 15g or 20g long. These fish are territorial, and while a mated pair would work in a nicely planted 10g, not two males. There is no "space" for either one to get out of the other's way, and that is highly stressful for one or both of them.
The four neons would be better with two more; characins (tetras, pencilfish, hatchetfish) are shoaling fish that live in large groups and the more there are in the tank the less stressed they will be (not exceeding the workable limit for the tank size of course, which would then be stress).
A mated pair of dwarf cichlids plus six neons would be a nice community, and for the bottom something like a group of one of the dwarf corydoras, or a single small-species pleco.