hmmm, i *might* have another problem let me know what you think. The tank is on a concrete floor, with a thin carpet, then the 1/4 inch plywood. I am assuming some water would have gotten underneath the stand....will this pose a problem? The tank will only be in that spot for another year, so even if it does stay wet do u think it will cause a problem in that time frame?

I used rubbermaids for my sump and refugium but now (5 months later) I want to either make an acrlyic sump or retro-fit an old glass tank with baffles.

They bow pretty bad and are probably not worth the trouble trying to put baffles in. As you can see i cut out the top of the lid to give it support.

a pic:

http://members.shaw.ca/jackbee/jacksrefugium.jpg

Don't try using the thicker weldon thinking it is easier to make water tight joints. It will get messy and work against you. Almost always leaks somewhere. Trying to seal pourly cut edges with thicker weldon sucks. I would use a table saw to cut your acrylic pieces. If you don't have one, maybe your supplier can precut all pieces. Make sure the pieces are cut accurately and square.
Just had to throw in my 2 cents again. Its probably all cover in that link above anyway.

Kari

I purchased acrylic from an auto glass shop a few times and got a MUCH better price than the local plastic shops. All you need to do is speak very quickly and they forget what they were doing. Or bring beer.

Try the off-cut bin at Industrial Paints and Plastics. They usualy have a wide variety at our local shop. I'm going to build a sump from off-cuts.

it sucks when you wake up to that gurgling sound in the middle of the nite, i know first hand as well. the first time my sump cracked on the bottom, it was a 45 gal. hagen and i found myself in the same boat as you wondering how to get that thing out as my stand is up against the wall and that`s the only way to get it in or out. the second time was one of my astreas going down my outflow pipe and not being able to get past the ball valve and blocking it off and thus we had flood number 2. i was given some good advice by someone at my lfs build what ever you`re building to fail because it`s going to. oh yeah i fixed the sump by gluing a piece of acrylic to the bottom over the crack.

Now ya' got me worrying... :cry: . I've got 33's from the same "supplier". Couldn't pass-up a bargain ? I've had one in use as a sump for a year and a half. I just set up two more (new) in the basement "laboratory". The sump tank has a centre cross brace (plastic frame). The new ones do not. :frown: . All are drilled for 1" bulkheads in various locations. The sump is not on foam...uh-oh.
Were your's drilled ? Cross braced ? Full capaciity...?

mine had the regular black bracing and was only filled about 1/2 to 2/3 of the way....Don't want to scare you, but be carefull, I ain't getting another one from there.