So I have a 55 gall. community tank with 3 "bunches" of Wisteria in it that are looking pretty sickly (green, but edges are starting to turn brown)...I really know nothing about plants, and quite frankly I can't keep a "normal" plant alive. I bought these plants about 2 or so months ago, maybe more, but I'd like them to grow nicer! I don't want to get into CO2 or any special lighting (the bulb is whatever came with the 55 hood), but is there any kind of fertilizers I can use that are safe for fish??