Sorry for your losses but you guys need to take a step back and slow down. Aggressive and reef doesn't really work. That grouper is gonna need a bigger home as well. I'd rehome him and the damsel before going any further. You could then do a fuzzy dwarf lionfish, snowflake eel and hawkfish if you want aggressive but semi reef safe. The chocolate chip needs to go as well.
Even well fed it will eat any corals it stumbles across. Just realize aggressive fish have big appetites and are very messy so keeping coral with them is difficult. No triggers, big lions, big eels, groupers, etc. check liveaquaria for tank sizes and always do research before you buy a fish
20 Gallon SPS reef
29 Gallon FW "fat catfish" tank
20 Gallon Long Dart Frogs "Zig" and "Zag"