Yeah I know they're doing fine now (and one of them is brand new anyways), but your other fish just died in the last couple of days, so I think it'd be best to wait at least two months before adding any more fish to make sure that those two continue to do well and don't get sick. I'm just saying what I think, you don't have to listen if you don't want to, but rushing to add more livestock only causes problems, especially if you have multiple fish that have died inexplicably recently.