I haven't had any issues yet. I really like the tank and am very happy with it. A couple of small things I wish I would have done different would be #1, not to make the tank 36" tall. Its an absolute nightmare to try and move rocks around or deal with anything at the bottom of the tank. #2 the overall size of the tank makes it nearly impossible to catch a fish, I had one that I wanted to move to a hospital tank due to cloudy eye, but I couldn't catch it. Lastly, I put the sump for the tank on the floor in the garage. I am trying to figure out a way to vacuum the bottom of the sump to clean up gunk, but since its sitting on the ground, I obviously cant get a siphon going. I will probably end up getting a powered gravel vac.