VERY YOUNG res not eating!!?

[ציפורה]

i rescued her yesterday from really bad conditions at a dollar store i tried feeding her last night and also this morning i took her out of the big tank and put her in shallow warm water and gave her like 4 options of food none of them seem to interest her ...my other 2 have also been eating less is it because its winter? the water gets kinda cold over night but always comes back to around 80 in the day (they are inside but near a window )
i have 3 young turtles all under 4 inches altho Gideon is close to 4 inches Ezekiel is almost 3 and little Ziva (yeah i changed her name back to ziva) is just a little bigger than a quarter their habitat is a100 gallon tank with riverbed rock on the bottom various sizes i have 2 filters one to clean the stuff out from the bottom and one for stuff near the surface i have 2 white lights one for heat one for light and a uv light on during the day and at night i have a black light. they have a floating log that somehow stays under the basking light i guess cuz the currents from the filters... i have bamboo in the corner and when it was summer i was picking lettuce and clovers from my yard (this was before i got ziva) im thinking of buying some fake plants cuz i know they like to play and sleep in the plants

 

[Skywalker]

He should be fed lots of protein as he is still very young. Try feeding him earthworms, Mazuri turtle pellets, feeder fish, crickets, bloodworms, krill, and some vegetables. They will become more herbivourous as they age.

If the water gets kinda cold overnight buy an underwater heater. A good beginning home for a small or baby Red Eared Slider is an aquarium. Purchase at least a 20-gallon aquarium. Also required are a filter, a heater, a pump and airstone, a sandy or gravel substrate, live or plastic aquatic plants, chlorine remover and other water conditioners, a small UVB bulb, a basking spot for the young turtle, and thermometer. None of these supplies can be left out of the proper baby turtle enclosure.

If its winter than he might be trying to hibernate. Don't let him hibernate. Trick him into thinking its summer by providing 12 hours of light per day and 12 hours of night and keeping the water warm (78-80F for babies and small juveniles). This will trick him into thinking its still summer and not winter. The air temperature should be mid 70's - 80's and a basking temperature of high 80's to low 90's.

If your turtle is still refusing food then he might have been sick when he was bought. Not all pet stores know what they're doing when they take care of reptiles. Sadly, turtles are one of the pets who recieve the most abuse.
Good luck!