8 inches is an absolutely bogus size... they get pretty big but grow relatively slow for a big cat. Heres a video of one thats around 19 inches.
[video=youtube;WLzn1_YN7Yo]http://www.youtube.com/watch?v=WLzn1_YN7Yo[/video]
They hardly ever move and prefer to bury themselves in substrate and wait for unsuspecting prey of swallowable size to meander by then they strike. I love them and hope to get a trio of them pretty soon....remind me of less active smaller goonch catfish.
Video is labeled as a pacman fish... The one in looking at is a chaca chaca and all the sites I've seen with info on them says 8" max... How big
They may get in the wild may certainly be different but who knows?
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Yeah and I have a bridge for sale......