How to stop roaches from climbing out of feeding bowl?

[DC101]

Hello everyone!

I want to start bowl feeding my 3 Australian Green Tree Frogs and i currently have a colony of 600 wood roaches breeding.

THe only problem with these roaches is that they can climb.

So, what could i use to stop them from climbing out?

Thanks guys! Ive tried olive oil, it works but im not sure if its safe...

[JeffreH]

The olive oil is safe ; ) I wouldn't recommend something that would harm your little ones buddy

[DC101]

I made a thread asking if olive oil is safe and many people said that it blocks their skin.