Try feeding some fresh veggies like zucchini. I cut mine in rounds and then use a fork, piercing it at the very egde. Leave the fork in it and drop the fork and all to the bottom of the tank and let them suck on it. They love it. Fresh veggies tend to help with bloat if that's what it is. It's just like using peas. Cucumbers work as well. MAKE SURE TO CLEAN THE VEGGIE SKIN BEFORE DOING THIS!