I think the cobalt power head is my favorite. Done with the RIO units. They are flimsy and fall apart just by handling them in the tank.
I have a 125 gallon discus tank where I change 40-80% of the water each day. I have a 44 gallon trash can that I age my water in and with this little thing along with some rubber hosing from Home Depot it speeds up the process like no other. Great power head and I've not seen any issues with it yet.
I think this product works well it seems to move the water around my 75 gallon tank well I like the fact that you do not have to hook it up to a bubbler because it comes with an air release tube the package arrived in great condition and the product was brand new thank you again aquarium Co-op great job
I am using this powered in a large cichlid tank. I have it running a diy sponge filter. Works great picks up a lot of fines from the water and adds just the right amount of circulation. Very strong and reliable.