I ran a full HOB system for 2 1/2 years no problems I finally went to a sump and love it my water is clearer and it is awesome easy maintenance as well I do use a HOB overflow siphon just had my tank set up and did not want to drill with running tank just a pain to house it all to do the work And I have my sump lvl at a lvl to where if power does turn off or if something fails My tank will drain into the sump and stop just before it overflows this is something to play with the height Of the return is the key to this and a Stockton valve is awesome for noise