Ew! This thing is frilly, wet, and slimy - most places won't want you around in it, except maybe those hipster fish restaurants. May I recommend the "Black Lagoon Risotto"?
Fish Monster Mask price in Growtopia: sells for about 1 WL (median of 1 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.
Recently sold at: TUKKU1, OANE, RKATH