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Adriana
the cube stays due to the vacuum cearte when u push against the glass. by cutting u will reduce the amt of air in the cube n so less vacuum force although it shd still stick. u must make sure ur cube is fresh as in nt damp (damp means there will be little air in the cube). what i assume is your cube when u cut it is exposed to dampness either from the air or your hand or other stuff. if nt in a split sec when u put the cube into the tank, u press it HARD agn the glass n slide it a little n it will stay. if reali reali cannot, worse come to worse u jus soak it for awhile n den feed ur fishes. they will still enjoy it. cheeros!
Sitegar
I press it firmly agniast the glass and slide it down the glass as I go. Mine tends to stick on there for a while. Unless you have a larger fish in the tank and they are able to knock the cube away from the glass.