From my experience raw cucumber is often too hard/unattractive for aquarium fishes and snails, especially if they're unused to it.

• Put about 2 or 3cm of water in a pan or small pot.
• Boil the water and put 0.5cm thick slices of cucumber inside it (should be mostly covered by water, so bit too many). Remove any seeds before, the fishes wing be able to eat those anyway.
• Then wait and continue boiling them. Don't worry about the cucumber floating.
• Once the slices become semi transparent they're done and you can try feeding them again.
• The longer you boil the slices the easier it is fur your fishes to eat them, but it might also become harder to move the slices in one piece.

Make sure to remove any remaining cucumber parts after a few hours.

From my experience raw cucumber is often too hard/unattractive for aquarium fishes and snails, especially if they're unused to it.

• Put about 2 or 3cm of water in a pan or small pot.
• Boil the water and put 0.5cm thick slices of cucumber inside it (should be mostly covered by water, so not too many). Remove any seeds before, the fishes won't be able to eat those anyway.
• Then wait and continue boiling them. Don't worry about the cucumber floating.
• Once the slices become semi transparent they're done and you can try feeding them again.
• The longer you boil the slices the easier it is fur your fishes to eat them, but it might also become harder to move the slices in one piece.

Make sure to remove any remaining cucumber parts after a few hours.