those plants are toxic when eaten, and in humans if you have sensitive skin the sap of English ivy can irritate your skin. otherwise, unless your snake is a vegetarian you will be fine. to avoid any mistakes I also feed in a separate tank.
mine are not potted. if he gets messy on his water dish or rocks or wood I clean it with a mild soap/water mix. same if there is a messy leaf or two.
also when most people start bioactive they get a rush of fungal gnats and or spider mites in the beginning. two ways to deal with the spider mites. one is just to keep the tank humid, the sider mites won't be able to survive high humidity environments. the second way Is to use predatory bugs. now your isopods will already be predatory and do eat mites and other problem insects, but they do not have very voracious appetites for that food source. to speed things up I have used the ol Home Depot lady bug cup. the lady bugs take care of the mites and you get to watch them too. win/win.
the way to deal with the fungal gnats that I've found works best is to just ignore them. they go away in a month or so.