It would be ok if you got a tiny one and kept it temporarily for like a month or two. But I would do just corals and upgrade the lighting through nanotuners or something along those lines. Keep just LPS or softies, zoo's, xenia, etc. I wouldn't try the other though. If you did what I am proposing, then you can frag and maybe make some money. With the right light, water flow and TLC, money could be made to support your 75 gal hobby. Just food for thought!