I am looking for comments, suggestions, improvements on a stand and filter I am building. Below are photos of what I have so far. The tank is a custom made glass 250 gal 48x48x25 with a single overflow with (4) 1.5 inch holes. (2) 1 1/2" durso standpipes and (2) 1 1/2" returns with siphon breaks. Doors are single full size lift-offs attached with magnet cabinet clasps and being finished this week. My cat is there to show scale, the octo is 3 feet long. Click images to see larger versions. The stand is all pressure treated 4x4 with 3/4 PT plywood on the top and bottom. We havent cut the top for the drill holes until the tank comes in to get them exact. The 4x4 is cut underneath for the holes and double supported to accomodate the thinner board (photo 5 & 6). The filter is (3) 29 gallon tubs connected by 2" tubing. The raised center tub is for water changes and crisis overflow which can be removed with a cap on the inside and the union ball valve on the outside. The bio tower has just over 30 gallons of bio balls-3/5 dry for ammonia conversion and 2/5 wet for nitate conversion. Notice the height of the outlet on the bio tower to keep balls wet. Photo 7 shows the carbon chamber in the final tub which will be drilled with tons of holes and have carbon in a nylon so it is easy to replace. Photo 8 is the protein skimmer. Turbo vortex 1004 verturi rated for 400 gallons. It just fits in the sump, but I have to move the removable bottom boards to get it in. It has a output tube for collection so I wont have to remove the boards to drain it. I plan on filling the bottom compartment under the boards with beach towels for added safety incase of a leak. Photo 4 is the Dolphin 2700 Ampmaster pump. I will plumb with flex pvc and output it's 2" pipe split for (2) 1 1/2" returns. Back will be left open for heat disapation, but the pump is supposed to be very low heat. Heavy duty marine seal on the pump. Prefilter is the covered thin tub over the bio tower (photo 3) and with foam and drilled with tons of holes to make a drip plate. I would like to make a DIY auto water leveler with a 5 gallon closed tank, but dont seem to have room. Any ideas?