I know that a lot of people say you can only see the fish from the top if you do a pond, but it's not really true at all. Check out my gallery and look at the photos I've taken of my fish -- you can see the whole fish! LOL even in my avatar, you're seeing a good portion of the fish, and you're seeing him from an angle you'd miss out on in a tank.
You'll need about 2500 gallons for those cats. Check out the DIY part for some ideas. I went with concrete, but it was probably more expensive than the wood-frame ponds, and definitely more expensive than the intex pools.
As for getting them up to size, the 12 inch cats aren't going to catch up to the TSN we're talking about in this thread -- all things being equal, there should always be a size difference, until they are each full grown. So, I know what you mean -- it would be good if they were all about the same size -- but I think leaving the 2 in the 125 for much longer is going to begin to endanger their health, and also, fish do wierd things when they're in small quarters -- you don't want anyone to get mean, especially if they're all going to be together eventually.
You'll need about 2500 gallons for those cats. Check out the DIY part for some ideas. I went with concrete, but it was probably more expensive than the wood-frame ponds, and definitely more expensive than the intex pools.
As for getting them up to size, the 12 inch cats aren't going to catch up to the TSN we're talking about in this thread -- all things being equal, there should always be a size difference, until they are each full grown. So, I know what you mean -- it would be good if they were all about the same size -- but I think leaving the 2 in the 125 for much longer is going to begin to endanger their health, and also, fish do wierd things when they're in small quarters -- you don't want anyone to get mean, especially if they're all going to be together eventually.