Thanks everybody for your input!! It was set up on a 300gallon salt water, but the
Guy I got it from did not use this sump, so he paired it with another 400 gallon tank he had for sale. So I did not see it up and running. However I do have one theory for the pipe going through. If he had it set up where his external pump would not fit next to the last chaimber on the right, ten he ran the pipe all the way through so that the pump was still pulling water from th correct chaimber, yet the pump sits outside the sump closest to the first chaimber.
So I am contiplating holes in the first chaimber so that I can set that up for filter socks with filter pad u see them...with possible bio balls under that, then insert a new wall in the middle section so that the water has to flow over that, then have a new chaimber for some k1 media, then put a wall to cover the gap under the last chaimber and drill some holes in the middle of that wall to let te water flow I to the last chaimber where the weirdly long PVC pipe will suck it
Back through the sump and pump it into the tank.
Thoughts??
The pump is a Aqua sea dolphin external pump. Just out of curiosity, anybody know what a sump this size and a pump like that would typically cost?