Hi Ruth,
I am going to try the Wave2k waveboxes in my 180g. Part of the reason is to have an alternative to all the hassels of plumbing in the OM 4way and other closed loop issues. If you can hold off a few weeks I'll let you know how I make out.(the boxes should be here tomorrow).
Also, looking on the Oceans Motions website there were a few alternatives of closed loop systems that didn't have the tanks drilled.
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