I have 4 freshwater plants from Petsmart, but I can't remember their names. I am also using fluval stratum substrate. My question is if I need to add anything to the substrate to feed the plants. Also, I noticed a couple tips of one of my grassy plants had some fungus-like algae on them, so I cut those tips off. I hope that isn't a bad sign of some bigger problem to come? A third issue: one of my plant's (the same grassy one with the algae) roots won't stay planted. The ends of the roots keep floating up through the substrate. Is it okay to leave it like this?