This is our 300 g poison dart frog tank. I finished the build 9-5-11 and added the frogs aprox 1 month later. It has 12 lucs in it. A 2 tier waterfall with a "river" in it stocked with hatchet tetras. I also use a mist king mister on it.
at the far right end of the tank you will see the water end into some rocks there is an over flow pipe hidden there it also keeps the fish and frogs out of it. The water then drops down into a sump under the tanks with bio balls..ect and from there pumped back up to the water falls. As soon as i get better at this board ill post a small video of the tank the pictures do the water fall NO justics it falls into a pond then changes direction. I will also post the filtering system.
That was a concern of mine when i was building it. The lucs tend to get in the water more then i would have expected , but i havent lost any frogs at all. I made it so the water line is at the furthest 1/4 from land and there are 3 pieces of wood entering the water and a sloped end to the right. The sloped part is the frogs favorite hangout they chill around the wood there.