Good luck with water changes when he gets bigger. Mine is about 12 inches long and I have to hold him back with a pond net so he doesn't attack the siphon tube. Sounds ridic, but when I was pulling the siphon tube out one day, he attacked the end of it (squeezing his mouth and head inside)and it left a huge gash right by his eye. I have no choice but to do so cause I consider him close to perfect specimen.