+1Chinese algae eater?
I traded two in back in the 90's that were both 10 inches.I can say with complete confidence that everyone is right so far. Definitely a Chinese algae eater. Effective little algae cleaner but some say they can get aggressive, sucking on and chasing other fish. They don’t grow too big otherwise I’d keep them in my larger tank again.
Not siamese, different fish altogether. Definitely Chinese algae eater, Gyrinocheilus aymonieri. Don't let the colouring fool you, they are very variable. Not come across one which doesn't get boisterous with age yet.algae