I've been working on setting up a dart frog vivarium in a 38 gallon tank. I have an idea of how I want it to look like. This includes a stream going diagonally down the tank. I started with pvc piping and siliconed sand and pebbles to it making it look more natural. I just don't really know how powerful of a pump I need for the stream? I was thinking at the bottom of the stream I'd have a small pool that would bring the water back down thru the false bottom and wrap back around to the pump. I also have been reading and a lot of people say you need a way to access the pump...I'm not quite sure how to do that because I will have to silicone the glass canopy to the tank so fruit flies won't escape. If anyone has advice I'd appreciate it!!