I have a 55 gallon with a few common goldfish and some minnows and gravel and a cave and everyone tells me to add plants...everyone has different opinions on which plants to choose. I found in the used classifieds some plastic plants and some vallisneria plants....which should I buy? I'm a beginner and don't want alot of problems...yes I have to clean the tank every 3 weeks cause it gets green....so what would make my tank look pretty and be easy? thanks for your help.

here you go check this link out you also need to know about the lighting and substrates as well so there is another link

http://www.kokosgoldfish.com/Plants.html
http://www.kokosgoldfish.invisionzone.com/...showtopic=15106

and this one is about disenfecting plants
http://www.kokosgoldfish.invisionzone.com/...showtopic=35594