in a perfect world, we would all have an UTH that covers 1/3 of the tank/tub. having a rack system i learned that u don't actually need that much heat (1/3 size of the enclosure). what u need is a hotspot. also it looks like u have small RBI hides so i assume u have a hatchling BP, so a cramp/cluttered space is fine. even if u move up a size in tub, i think your UTH size is fine as it covers the hide and more.
Edit: BTW what water bowl did u end up getting? the cute one i hope.![]()