ofcourse you get very well airated water in the sump which is good. Basically this worked very well, except in a CO2 added tank this drives ALL the CO2 out of the water. i added some course foamblocks on top of these the be able to clean leaves and large debris before entering the bioballs. So the water from the tank ran onto drippplates on top of the bioballs. Both these pipes (app 130 and 150 cm high) where filled with bioballs and stood in the sump. In my situation the wholde in the side of the tank led to another small glued box to the outside of the tank from wich two pipes (one over the other) led to two clear pvc square 15x15 cm tubes. Glueing the overflow box to the outside would be nicer to the tank, less obtrusive, but could also be done inside the tank. Seeing some fish behind the divider was a a pain because i could hardly get them out (deep and out of reach)Īll this would have me nowadays make a square, easy to reach overflowbox which could be filled with a large coarse foamblock which would a) block leaves and large debris to get into filter b) be easily cleanable/exchangable and c) not be a hazard to fish and even young fish/shrimplets. Later on when i decided to get some smaller fish this was a problem cause very small fish could get through this. I used some special plastic grate to keep fish from getting over the divider. This gave the draining risk again, so i crafted and glued a small box over the sidehole in the tank (open on top and glued inside the dividerspace on the tank wall)) to act as drainsaver. Later i thought that i woudn't get enough circulation so i decided to add a hole in the lower end of the divider to get water from the bottom of the tank in the filter too. The overflow was set so when the power cut the tank wouldnt drain by itself. I put in a divider (a glasspane glued between back and side thus creating a triangular space) in a backcorner to act as overflow and made a hole in the side of my tank to get the pipe in. I build my tank and sump with discusfish on my mind, so it could cope with big tunrover rates and the sump had to be able to house a lot of media. Just some thoughts about this subject from my own experience.
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