I had a MaxiJet 900 in my tank for circulation and just moved it out because I didn't like seeing the big black think hanging in the corner. The new MaxiJets are sealed for external use so all I did was attached a couple of flexible pipes to it and hang it upside down outside the tank. I am waiting for lily pipes to arrive to do the final cleanup of the green Eheim pipes I'm currently using with it. Seems to work well with no leakage. The only slight problem was finding some plumbing bits that would adapt the intake to 1/2" tubing.