I dont remember the name of the user, but i saw a picture of a terrarium with no cocofiber/earth...
In this terrarium there were only some bricks (the dry part) with all water around...
is it a right way to house our african bullfrogs? For sure i see the easiness of cleaning...are there any negative aspects?
As Jack said, it is not right way to house them.
They need about 50/50 water/ substrate set up, they need to have choice to burry themselves or to stay in a water, they need hide so sorts, it can be plants or anything.
Save one animal and it doesn't change the world, but it surely changes the world for that one animal!