They might nibble the aquatic frog pellets. I used to boil romaine lettuce in dechlorinated water for about 30 minutes and then freeze pieces with the boiled water into ice cubes. You can then cut off little pieces or toss the whole cube in. They also love dried seaweed sheets found in the aquarium section. Just break off small pieces for them.



http://m.petco.com/product/116580/Om...n-Seaweed.aspx