hey mat. at the museum we have a tank full of temperate anenomes. They don't need metal halide, we just have T8 lighting for them. I wouldn't put shrimp in with them unless you want to feed the anenomes. We just have cats eyes (turbo's) in the tank to keep the algae down. Our anenomes are hand fed mussel pieces once a week. (I normally give them 1/8 of a mussel each). In terms of filtration we just have a sump and trickle filter (Wool, bioballs,wool) plus a carbon filter.