What is on the ground???????
It looks like you have serious water issues under your house. I can see a water line 6"-8" deep on concrete! You will want to make sure this is an old problem. On the fish tank thing, looks like you'll play hell trying to find something hard enough to pour concrete on. But one great idea I can think of is get two sheets of 3/4" plywood and rip them full length(8') long by height of floor trusses minus 1/4", this will make it easier to get them in. Now take them, should be about ten of them, and bring them under house with some decent nails. Start just past one end of tank and slide boards above foundation wall about to where the upward web attaches behind foundation wall, this should leave at least 4' or so past the front of new tank. Hold them flush with bottom of truss and nail to truss every 8" across top and bottom and on diaganals. Do this on both sides of them, should be five trusses, to get you beyond both sides of the tank. Now that thats done, scrape the earth away from bottom of foundation along this wall to expose lip of footing. Now you can cut 2x4's at angle that rest on footing ledge at ground and go to bottom side of truss about 2' off wall. You should place building or tar paper under these on concrete and use 3" screws, 2 in each board, to fasten to truss at each truss you have plated. Now you are ready to fill tank. And don't forget to check into that water marking. Good luck!......
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Last edited by triple D; 03-03-2008 at 04:15 PM.