Does this mean they're getting enough food naturally in the tank? I have mentioned before that I never see any algae, I'm sure they eat any before I see it. There's also plant matter in the tank. Usually they do NOT eat the cucumber I put in there, but last time they did and they stayed on it for the entire 12 hours I left it in the tank, so I assume they were starving. I added another one today a few weeks after the last one, and they aren't going anywhere near it again. What's up?