Chemical fertilisers are definitely big no-nos lol! Like will said, i second the fact that broms do not need anymore fertiliser than the pooping of the frogs them selves. I also am not sure about the Parlour Palm. In my opinion, if it needs fertiliser than it really should'nt be going in a vivarium. Just my 2 cents but if your set on getting some fertiliser i do believe there is some sort of natural dead fish fertiliser. I am not exactly sure about it and have not heard any reviews on it either. I have had my vivarium up for over a year and all of my plants are doing great without any fertiliser.

Hope that helps!