not necessary .... as sugegsted by bro Solo, i would think that circulation and make sure your water have enough oxygenated is important for the growth of aerobic bacteria... however, there is no harm in running them. in fact, it is good to run phosphate remover right from the start =)
invert, coral are usually unable to tolerate medication like copper... unable to quarantined them with med... however u can isolated them and observed to prevent spreading of parasite should there be any?
invert like shrimps may carry hitchhiker like ich parasite however they are unaffected by it... so it will be best if u leave it one site for a while to let the ich die off without host to ensure that ur tank have absolute no parasite