:read: As a precaution I am having to reseal my tank due to a hungry pleco., And am rethinking my set up. All I have are some loaches. I recently lost one clown that I had for almost 30 years. I understand that there are many variables, but generally with a fresh water 60 gal undergraval continuously running a magnum 360, would a 600gph pwrhd be ok if I am running the two at opposite ends of the tank. I also was wondering about how the two would effect each other. Should I go with a reverse flow pwrhd in order to complete the flow of current. I know that mags. are old school. I remember my years with several tanks of Dempseys, these days I prefer something requiring less maintenance. Any suggestions. Be kind.