I've been keeping marine tanks for about fifteen years, but until about six years ago, never anything more than 20-30g.
In September 2005, a friend of mine who lives in Waco, TX called me. He was on vacation in Las Vegas, and he was freaking out. Hurricane Rita was headed for the Texas coast, and they were predicting it would run through Waco. His problem? He had a 175g tank and he didn't want to cut his vacation short.
So he had me drive from Dallas to Waco and catch the two fish (spotted puffer and monodactylus that he'd acclimated to full SW) and a horseshoe crab he had in his mainly empty tank, and temporarily house them in my 20g qt tank. (Yes, two fish and a crab were the only things in the tank.)
Rita missed Waco, thankfully, but when he got home he realized he didn't miss the water changes and maintenance. He offered me the tank for free, on one condition. I had to leave the Texas flag he'd painted on the back of it. So I drove down again and we loaded up the tank. I got it home and took stock-
* 175g tank, not reef ready
* 4ft fluorescent shop light
* tiny wet/dry sump
* rio return pump
* laguna "powerhead"
* two MJ-1200s
* maybe 10 lbs of "live" rock - really lace rock
* maybe 2" of sand
- no skimmer
- no ATO
First thing I did was ordered 90 lbs of pre-cured fiji premium live rock from DrF&S. When it arrived, I also picked up an additional 100lbs of live sand from an LFS.
I put the sand in the tank and let the rock continue to cure, since we all know that pre-cured rarely is.
Here's a shot of the tank after the sandstorm cleared.
While the rock was cycling, a buddy of mine decided to get out of the hobby and offered me his 55g tank for a song. I couldn't resist. I decided to set it up as a display fuge, dumping into the same sump. It had 4 x 54w T5 lighting, which is fine. I dumped in 75lbs of pavestone crushed limestone sand, and set it up next to the main tank, but quickly realized the little wet/dry sump I was using could not handle that much volume. I snagged some chaeto and caulerpa sp from friends, and away it went.
I trawled the local message boards and picked up 3 250w MH lights (two PFO, one Hamilton).
A local guy who works with acrylic made me a nice sump to fit under the stand of the main tank. It's in two pieces because the stand openings are narrow but tall and the center divider doesn't come out, and I wanted as much volume as I could fit in there.
At the same time, I picked up an AquaC EV-240 skimmer, and a couple of mag pumps to feed the tanks.
I really had to shoehorn the sump in there, and I was fiddling with those bulkheads for days to get them lined up without leaking.
That's the basic set-up I've been using. Since that point, I've added a hacked up ebay ozone generator, a DIY ATO, a Neptune AC II (replaced by an AC3 Pro later), a DIY dosing rack for two-part (later replaced by a re-purposed medical dosing pump), a rack mount UPS for the return pumps, a chiller, and four vortec mp-40s + battery backup.
That's it for equipment..