i had one that i fed nuclear waste and it grew to 3 feet long. sadly one night it crawled out of my tank ( yes it grew legs also) and ate our dog and we havent seen him since. i had to lock my bedroom door at night lol. but i think the cyanos get bigger
i saw a large texas(cyano) that was getting returned to a LFS,was healthy,owner was just bored with it.had to about 13-14 inches,fat i say close to 2 lbs.