Hello Francine I like the overall first draft idea. I don't think the 4x4's are over kill. The 9 foot length might warp in the middle over time from the weight with just 2x4 but the 4x4 will keep the strength. Notching and running carriage bolts through it is also a good idea. I just moved and rebuilt some stands just out of 2x4's but my length was only 7 foot long. I made the stand to hold 24 ten gallon tanks. Three rows high. I used 3" screws instead of nails and I did drill holes and used 3.5" carriage bolts as extra support/strength for my up right legs. I have another stand that I had built around 5 years ago that holds 10 10 gallon tanks 2 rows high and built it the same way and haven't had a problem with it to date. 1/4" plywood sounds nice too. You reallly don't need anything bigger seeing as how your edges are match up to tank size. If you are using the plywood as extra strength, that's over kill. If its to keep the fish from seeing through the bottom of the tank, just paint your tank bottoms brown before setting back up. I just put thick brown cardboard under my tanks so the fish couldn't look down to the tank below. Anyways good luck, just make sure your cuts are nice and square, this will help keep the thing from twisting while you are putting it together. John ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!