Well i just got back into the fish keeping hobby, and have a few 5 gallon bow tanks with a dividee in it. I tried using a regular manual gravel vaccuum but i cant seem to get the siphon to start. I know there is a trick to lay the vacuum nozzle flat in the tank to get the siphon started but with the divider in the tank i cant do it. So im done with the manual vacuums. Anyone know of a good electric vacuum?