Past few days my fish has been chillin down by the rocks. She still eats, but after shes done she continues chillin down by the rocks with the light on/off. Her stomach seems bloated and I never over feed her. I had her for about 6 months and shes about 4.5" now... any suggestions?

Shes in a 55 gallon tank and the only fish. She used to be very active before until the past week.

OK 1st can I ask you for water reading for ammonia,nitrites,nitrates,and PH.You say shes still eating,is she still pooing ??is it hard? whats the main diet.? if its just pellets she could be constipated. try earth worms,and a mix of peas,lentils,maybe muscles,prawns. if this is already part of the diet can you tell if any of the scales are lifting or is the swelling just in the stomach.its important you give water results and please don't say "good" that's not a lot of help.

Ok ill get water test results. I feed her dry pellets/frozen blood worms/frozen beef heart and sometimes live brine shrimp.

can you share us your filtering system? how often do you change your water?
as i had posted here previously, i am not used to change my water, but
i believe filtering system plays important role in it.

please do not misinterpret me. people in this forum
do their things in a scientific and correct way. i am
now doing the same in parallel with my primitive way.
i will post the result later.

Sounds like the diet is too high in protein (frozen blood worms/frozen beef heart) I would guess constipation. You can treat with Epsom salts at 1 tbl per 5 gal. Even if it isn't constipation the epsom salts won't hurt.

i still agree with marcus. your water reading is
important to determine what makes your fish acted that way

A bloated stomach can be a bad sign. I would cross your fingers for constipation. I wouldnt feed for a couple of days and hope it clears. Test results for the water would be a good idea to check everything is ok with water quality