I've had my new- to- me 29 Bio cube running where I'm going to set it up with tap water as a test. No leaks, no water loss - but soft moist salt ( easy to wipe off with just my finger) wicking up from the bottom plastic. The spot is about 1/4 x 1/4".
Any call for concern - I saw it up and running before purchase.
Any call for concern - I saw it up and running before purchase.