Could your red eared slider eat roaches?
If they were feeder roaches (not just normal house roaches) and small/soft enough, I suppose you could feed them to a red eared slider.
A red eared slider will eat strawberries. My red eared slider eat strawberries once a week and maybe half of one. Don't give it to them every day because they are very low in protein but your turtle will love them! i know that the pellets have the most protein and vitamins so you should check that out!
If following rule of feeding as much as he can eat in 20 mins this red-eared slider turtle could eat half a bottle of food and he is always begging for more but in Winter he won't eat why?
Yes. The most common fish a Red Eared Slider will eat is Commet Goldfish. Red eared sliders will eat fish, but fish are full of worms and parasites which will contaminate your filter. For an indoor slider I suggest only pellets and veggies. Plus they eat parts of the fish and the rest you would have to clean out right away. My slider loves just his pellets, he snubs romaine lettuce and any other veggie…