I put this above my co diffuser to help move the most around my tank. I am using it in a 20 long and I have it angled to help move the co and create some surface agitation to improve gaseous exchange. The pump is perfect for this size tank and silent. It did however pull in my sparkling gourami and kill him. Hasn't had any effect on the harlequin rasboras or the CPDs but I am going to hide it in some course filter foam the next big water change I do.Suction cups have done a good job so far securing the pump but I'm probably going to end up attaching waterproof magnets to lock it in place.So far so good, I'll update if there are any issues.
Rating: [5 of 5 Stars!]