This is what I do
You could tyr something like ths:
power head at one end
small gravel on the bottom raised by rocks at one end (I prefer nutmeg gravel you
dont have to raise the gravel but thats what I would do cause i think it would look cool)
you could then add some river rocks
then plant some amazon swords(cause i like amazon swords and the will look cool)
throught the current along the back side of the tank
and of the opposite sied of the power head
ps i wouldnt add frogs to this type of tank
try a fish whose natural habbitat is a deltal or river
if you want frogs or something other that fish
i reccomend making them have there own tank
I had affricaan underwater frogs in a tank with
huts/rocks/caves and large greavel
o yea check out
http
/fishprofiles.com/profiles/ when you search for a fish
select river and/or delta in the ecosystem box
hopes this helps

good luck
see my sig ->
(keep me updated with pics - cause im courius to see the outcome)