Review on Hang-On Marine Color RDC 150: Advanced Needle Wheel Protein Skimmer for 40 Gallon Saltwater Aquariums by Lisa West

Don't waste your money. The block is very badly processed. The return pipe was so poorly machined that it was a very loose fit. Because of this, customization is almost impossible. The bracket on the device is not removable, the upper part of the case protrudes far enough to prevent the bracket from slipping off. while the main body is much smaller than the bracket hole. This results in the device sitting slightly slanted in the tank due to the distance between the main body and the bracket, with only one screw holding the main body in place, and this cannot be compensated for without locking the device in your tank. This could be fixed by simply adding a second or third nylon screw and threaded hole on the bracket. I had to fiddle around and modify a lot just to get it to sit properly in the tank. This device is self-breathing and it tightens all the screws as tight as I dare tighten a nylon screw. This can either cause it to overflow or cause the water level inside the main body to drop so low that foam forms in hard-to-clean areas. I do not recommend this device, look elsewhere for better quality!