Back in 1999 when we moved out of an apartment in downtown to a fixer-upper in the 'burbs, I took down my large marine aquarium that I'd maintained for a number of years. This was a big reef tank -- 220 gallons in all -- with a good 300 lbs. of live reef rock and other stuff. In terms of dimensions, we're talking larger than a coffin. It was big. But the immediate future held lots of work for me on the new house so I took the tank and all the equipment down to Henry's shop. I always figured I'd set up another system and a few weeks ago a friend in our building set up a reasonably large one (150 gallons) and I pitched in with a bit of advice from my experience -- though as a PhD in chemistry this sort of thing is right up his alley. So I caught the bug again. Interestingly, things have changed; it's become easier, actually, so yesterday I went about setting up a smaller system -- about 50 gallons. I'll try to get into all that later, but for now, it's 6 a.m. on Easter Sunday so I must post...