da colts":yqzpwr0o said:they suck, i have 4 of them that i bought at the same time, i should have bought 1 and tried it then i would not have bought the other 3. hydor has a great little item out,its called the hydor flo, it actually attaches to the output of a powerhead or the return from the sump, the water flow powers it. it rotates 360 degrees, very cool device, i have had 4 of the for a month and they work great(a month already beats the zoo meds piece of crap) here is a pic of 1 on my tank.