Theta is kept on a half gallon with daily water changes. I noticed after doing a 50% water change when I went back in to check that a small piece of gravel was floating at the top of the tank. I went to wash my hands to remove it and came back just in time to see Theta take it into her mouth. I watched closely and did NOT see her spit it back out. Since then she's been clamped on and off. Is there anything I can do to help? Is it even possible for her to swallow a bit of gravel? I feel fairly helpless ATM.