umm...interesting...lol. Not for cichlids over 12"...lol. Imagine an Umbie in that....bust the glass tryin to get to someone...lol.....again interesting. I wanna build a couple 300gal tankz that are connected by a 2 foot diameter PVC pipe or sumptin. That would be pimp.....still be regular tankz, but 'twice' the tank space for your fish. I could tear it up wit pikes thats for shore! Be ideal for breedin cichlids...then they could go from one tank to the other to get away or breed...lol.