u should be fine without a chiller you are not running metal halide lights. if the light u have is incandescant than that is not good enough. the gobies in that environment should be fine with a broader range of peramiters they are not coral reef fish.
not bucause of temp issues, or light, or stocking but beceause of law issues
, i run the same risk as owning an asian arrow, or a sting ray in cali but with much bigger fines