sigh none of these people know what they are talking about..
1. Can I put a quarter sized r.e.s.t in a larger tank with gold fish,a clam, and a frog?
yes you can but you MUST provide a basking spot
the goldfish and frog will eventually get eaten, if not in 2 years or 10
2.How many pellets should I feed him a day?
reptomin probably? enough that would fit in his head if it were hollow about.. 2 sticks a day, break them up for him
3.Can I just warm him with a reguler lamp with out a shade?
50-100w spot lamps work great for heat, they are less $$ too
but you cannot save money on the UVB lights, get a reptiGLO 5.0 or 10.0, DO NOT GET REPTISUN
4.How often should I clean his tank?
with a decent filter, once a week, with 50% water change
with a EXCELLENT filter (fx5, xp3, xp2) once every two weeks, with 50% water chance
5.Is it ok to intruduce him to my dog? (she's rather large)
no, the dog could kill it instantly