I picked up a few mis-prices 10gal tanks at PetCo a while ago with the intent to use them with my saltwater aquarium, however I got over ruled by the wife and now I am to make a tank for my 3yr old. As cool and colorful as poison darts are, for a 3yr old the price is just too high so I am leaing towards Fire Belly Toads.
Pardon the stupid questions, but I dont wanna screw this up and be on the couch till next Christmas (she is wanting to make this part of his Christmas presents this year)
From what I can find on here and online, 10gal will work for a pair of them?
Experts say 50/50 but realits is 70/30 water to land?
No gravel, but bigger decorator rocks work for water portion bottom?
Get the repto filter not a standard aquarium filter?

I saw the TetraFauna Vivarium...but for the price it just isnt worth it (see above about dart frogs). I have seen a few videos on YouTube where the guy uses foam then covers it with sandless grout then paints it...is this frog approved/safe?

Thanks in advance, my 3yr old will thank you as well