08-12-2007, 10:59 PM
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OK, I've been through this with three 20 highs, and it's a pain in the fundament.
Get a big plastic storage bin. Clean it out well and siphon all but about 4" of water out of the tank and into the bin. Net the fish into the bin.
Water is 8 lbs/gallon, assuming your tank has a 36x12 footprint, that'll be about 7 1/2 gallons of water - that's about 60 lbs. The tank itself weighs about 40, so that's 100lbs, and that's counting substrate and hardscape as water. You should probably add another 4 lbs per inch of substrate on average (assuming it's between 150% more dense than water). So you're probably looking at 110 lbs. If you have any big rocks in there, take them out before you move anything.
Make sure the stand is where you want it. Unhook all your filters and heaters and lids and lights and set them aside.
Make sure the outside of the tank is 100% dry. Get a friend who you trust to not drop things (you could probably do this yourself, but 3' is pretty awkward) to lift the tank from the table to the stand.
Put all the equipment back in. Put any hardscape you removed and half the water back in. Make any adjustments to the aquascape you need to (it might have shifted). Put the fish back in. Discard the rest of the water and mix up a new batch to fill the tank up. Hook everything back up, but keep the lights off for the rest of the day. The fish will be plenty stressed enough.
I've got to do this with a 50 gallon this month. Not looking forward to it. Should be b/w 225 and 250 lbs.