If your looking fo
a gecko try a leopard gecko. I have four and can easily be bred. For a thirty gallon you could get several, but make sure you don't get two males or they will fight once they reach sexual maturity. Also once they reach maturity which takes about a year and a half, you shouldn't house the male with the female because they will mate and its not good for the female. If you house more than one female together than they should be fine. Try finding out when the next reptile show is around where you live. You can get one there for cheaper and you buy it directly from the breeder.
Hope this helps if you think you want a gecko.
55 Gallon-two clown knifefish, chocolate pleco
46 Gallon Bow Front-Planted-swords, java fern and African cichlids, sail fin pleco
29 Gallon-black ghost knifefish, bristlenose pleco
10 gallon-brackish, figure-eight puffer, knight goby