Those are very similar to the Pyrex bowls I used to use...picked 'em up at Walmart in their cooking dish section! Nice and heavy and easy to clean. Unfortunately, I needed to go with a larger dish and went with a SS water bowl to ease up on the weight a little. If I had a tank, though, I'd probably be using the largest Pyrex bowl I could find! They also came with lids so came in handy if someone needed a little soaking time...![]()