While I was cleaning my tank my lighting thing fell and it had a bunch of salt in it and the salt level went up and they died after a while excepy for one. I am planning on getting a sea urchin for the algea and I guess some damsels. Any sugestions on other stuff that are cheap for a twenty gallon tank except live rock

My fish died
Any sugestions on how to prevent these aweful tragedies
someone are you there
I will hopefully have pictures soon
please give me suggestions
I need good fish for a twenty gallon reef tank