Hi all, I have a little dwarf puffer, and she has been getting a little thin towards her back, like starting right behind her pectoral fins. She gets roughly a pea sized amount of frozen blood worms every day, once a day, and she eats all of it hungrily. Am I not feeding her enough food, or could she be stressed? I have her in a 2.5 gallon tank with an internal filter, a heater, and lots of plants, but there is a little bit of an algae problem, that I plan on cleaning up soon. She is the only fish in this tank. Thanks.