I've had a Lettuce sponge for a couple months now, and it seemed to be doing ok,,,my frog spawn that was in front of it has been doing "Very" well since the sponge was introduced beside it. Well I found out why. Seems the frog spawn has been rubbing up against the sponge and somewhat feeding off of it, as the sponge now has a huge hole on one side of it. Do I have this correct thinking the frog spawn has been feeding off the sponge?