Beat up fish...

[Coasting]

This is what I use.
http://www.petsmart.com/product/inde...AvailInCA%2FNo
May not work on a euro brace unless you used a bit of tape to hold the brackets, but the brackets are metal and can be bent to fit about any shape of rim if youre gentle and don't rip them off all the time like me.
Or they sell those plastic breeders.
http://www.petsmart.com/product/inde...AvailInCA%2FNo
Or Critter keepers which you can find down the reptile isle, or small animal isle or just about all over the store.
Youll know what works best for your situation.