Its nothing mutch but this is how I do my filters... This one is a small version for a friend of mine. Take 1x tube or pipe. I am lucky cos the workshop next to my work has loads of this pipe that they dont use. So I get it FOC! Drill 2 holes in it. The one at the botom should is for an electrical gland. You will see why later. The top one is for your "out" pipe. I like to cut the out pipe like this because I feed my fish by dropping the food into the top of the filter. When feeding flakes it drops the flakes down to the bottom so everybody gets their share. Inc bottom feeders. When feeding pellets you have more space to drop the pellets. If you cut the pipe strait the pellets just sink into your filter. Not a good idea!! The small pipe will be conected onto a 400L\h pump. They are cheap at about R70. The gland has a rubber in it and that helps to seal against the pipe. I still like to over do things so I add silicone aswell. I made the pipe that will go into the big pipe long, put the silicone around it and then just pulled it back again. The rubber in the gland stops the silicone from coming throu and it seals perfectley! Siliconed the outlet pipe in place and leaving it to dry till tomorow. Tomorow I will do the bottom and the gland. Till tomorow!