HOSStile

I am new and overwhelmed. I am not a techie but need the advice/assistance of one. I try to nurture my fish but they keep dying - no pleco (had 4, one at a time of course) has survived yet and one rainbow got all contorted (the polio thing I am told). After the rainbow died was going to quit because I was doubting myself so much. I don't want to continue if my fish die. Any advice on how to pr