I've only owned small (sub 20 gallon) aquariums from these two manufacturers. They produces completely different product types. Sea Clear generally produces "conventional" rectagular acrylic aquariums, while Clarity Plus produces specility tanks (hexes, table top cubes, etc.)
Both build tanks of comparable quality. None have structurely failed on me, and both fit n' finish are top notch. I don't know how else to judge an acrylic tank.
Are they acrylic tanks? I think they are i may be mistake. I dont have any experience with them but i am getting a 180 tenecor acrylic soon. You may want to check them out.
