Hello, posting for my friend who has a BGKF. He has had it about a week it's about 6" and the other night he noticed it laying on the bottom. When he came up to it it started swimming around like normal again, but, he noticed it had a little worm looking think under it's head. I dont know if all BGKF have this feature or if his may have some sort of parasite? Anyone may know what this is?