um... my friend stuck his hand in mah tank with my big aro and gars.. anywho hes hand had some paper mache glue stuff in it and its in the tank. i siphoned most of it out but uh... fish gonna be OK? lawl.
what kind of paper mache mix did he have on his hand? most mache mixes are organic so it wont hurt the fish. i would just do a water change to get out most of the residue.