Well...not sure if this is what youre thinking of, but i have mine two mounts in/above the terrapins terrarium.
Theyre hanging above the water, and the tank is open, with no cover on the top. The tank is placed near by the window, but is not reached by direct sun. And as i get more mounts, they will live in here too, as theese two seems to love the environement! The biggest one i belived was a "gonner", but after i moved it to the terrarium, it has awakened from the dead, growing two new leafs, and new roots as crazy. The mini has only been there about a week.
I dont dunk the chids in the water, thoug. The terrapin is a really messy creature

, and i dont think this water is the best for my chids. I lost the big one into the tank one day, but it seems to be fine, and are still growing like crazy after this.
But i do mist once/twise a day, directly into the tank. But no fertilizer... When i use this, i take the chids away from the tank. I dont think the terrapin would appriciate the fertilizer as much as the chids do...
Picks.


