eys i have one in my 75gal iv had it about 10-12months. it was abot 1.5in long when i got him and now is only about 5in long but is fat as could be looks like he swallowed a half a rool of quarters lol i would say his belly is an inch maby a lil bigger. i hardly ever see it only when i turn the lite out and have enuff background lite to see