I may be getting more fish very soon, so I'll need more QT space. I was wondering what other's here have used in the way of Rubbermaid or plastic storage bins. I've had excellent luck with the opaque plastic bins used for storage. I put one inside the other and do not over fill and they have not bowed out at all. Doubling them up seems to work very well. These storage bins hold about 15 gallons and are great for the baby goldies, but I'd want something bigger for these new fish.

Any suggestions and pics would be welcome.

If you want to go for the gusto, you can get very large rubbermaid containers designed to be livestock waterers. They are sold at farm supply stores, like Farm and Fleet, and you can find them online. They are relatively inexpensive.

Here's one site: Farm and Fleet

I've used kiddy pools for larger fish. Their cheap and durable since their designed to hold water in the first place.

Just a warning on the bins, I bought a heavy duty black plastic one and the toxins leaking from it killed most of my golds, I only managed to save 2

Wow, sorry to hear that. I've been using Sterilite opaque bins with no problems. The fish do fine in those. I may go ahead and get the 300 gallon stock tank. That will make a fine QT.