Advertisement So I have had my water striders on the top of my 20G fish tank for a while now, and they've been laying eggs for a good while as well. My water levels are not constant, though, so I think all of my early eggs dried out. I tried putting a pregnant guppy in a breeder box at one point (I felt too bad and ended up just getting a separate tank) and the breeder box is still in the tank because the water striders have laid numerous clutches of eggs there, and it moves up and down with the water. Now to my point. I have my first water strider nymph in the breeder box, and it is TINY! I've been feeding my water striders flightless fruit flies and the occasional grasshopper, but this nymph isn't even half the size of my flies! Will I need to find something smaller to feed it, or will it be able to feed on the flies even though they are so much bigger and tower above the nymph in the water?