hmm well if ur doing sps i would suggest cutting ur snail populaton in half and ditching the crabs,and harqulem shrimp. the crabs will irritate the sps and disturbe the sand. 50 snails will create a huge bio load and they will have alot of die off. for fish list i would suggest not doing a pb tank waht so ever. i wouldnt do n e thing on ur fish list besides maybe the mustard tang nd the gobies,and clowns. the tangs u could have in a 75 long term is this
chevron tang,kole tang,scoppas tang,purple tang.
angels in an sps tank-flame angel (if kept well fed and in great health he shouldnt pick at corals and if he does it will be a polyp), coral beauty,potters,flame back angel.
the hawks might eat ur shrimp.
gobys are a great addition to any tank as well as wrasses