Sorry Spongebob.. could of sworn I had replied to you.

I have 5 wtfs in a 55 gal tank(a little small).. The plants I have are; pothos, tall philodendron, and something that got smashed..

The pothos is doing good, the philodendron is half dead.. and the smashed thing keeps producing mushrooms.. which is a cool thing.. but not a great thing. I really need to redo the tank soon.
Some great plants to use; pothos(grows with no trouble at all) Ivy type philodendron, and snake plant(also called mother-in-law tongue - a tall spiky looking plant). AND you can ALWAYS use Lucky Bamboo.
ALL of these plants are said to be safe for non-plant eaters. AND they hold the FAT FROGS WEIGHT!!! Which is why I have a smashed plant I know longer recognize..

BUT stay away from Ficus and Diffenbacha(dumb cane) plants.. Sap from these can cause rash on skin and death (dumb cane only) if eaten.. even if passed along to crickets/bugs..
Hope this helps some...