Cucumber!

[Guppy Goon]

Is cucumber good for fish? Because mine seem to love it!

 

[fluttermoth]

It's not bad for them; on the other hand, there's not that much nutrition in it either. Courgette would be a better food for them

 

[Nathen]

It's not bad for them; on the other hand, there's not that much nutrition in it either. Courgette would be a better food for them

You could also try some lettuce, yolk of eggs (boiled) Infusorians, brine shrimp and some of my guppies tend to love carrot? (boiled) especially the liquid for fry