its made out of plastic and i would buy some plastic and glue it togehter. to make a return section. and the other part a refugium and the intake. would this work? because the cabenet is so small that is the best i could do. or make the hole sump out of plastic then i could house a skimmer.

im getting 15kg of it 
also i brought coral gravel.
i am going to add more rock mybe 2-3 kilos at the moment i have 15.5kg. in 25 mins im going to get a red light and see what els i have its time to go udercover
just seen a shrimpy thing with no legs on the sand
it had black eyes i think. i coulnt get a picture of it because of my crapy digital camera its got good zoom but in macro setting its rubbish it only realy works on flowers and thats it. could this crab be the same one i saw in day light but it was just pale because it was stressed? i get you more pictures of the rock as the sand has cleard