The calcium powder will just likely wash off the crickets or any other food that goes in the water, so I don't recommend them. Cuttle bone and a good UVB light are better than calcium powder. The exoskeleton on the cricket does not provide calcium. Insect exoskeletons are composed of chitin, which is an insoluble polymer, and there's no calcium in it.
You can look for some pelleted foods that contain Vitamin D3 - Turtle Brittle by E-Nasco is a really good one, but you would have to break apart the pellets for such a little guy before feeding time. Got to http://www.enasco.com/prod/Home and enter in "Turtle Brittle" in the search engine on their page. You can only buy it on-line as far as I know. Reptomin isn't bad, Wardley's and ZooMed also make a decent pellet, although those are still a bit too big for your guy.
Earthworms are a great food - good calcium
hosphorus ratio, very nutritous.
Do you have lots of hiding areas? Turtles, especially hatchlings, like to have a secure place - hatchlings are the potato chip of natural world, and they know it. They're happier with some place to hide, and a happy turtle will have a better immune system. You can get artificial silk plants at dollar stores or Wal-Mart, and just rinse them off and put them in the tank. The little guy will be amusing hiding and climbing in them.
You are aware that your turtle could grow 8-12 inches long, right? Remember, the "inch a year" recommendation is the IDEAL, but not an absolute. I've seen some very healthy turtles that grew 2-3 inches the first year. The idea is moderation. You want slow, steady growth. If it makes you feel better right now to feed small amounts twice a day, it won't hurt. BUT, once you start to notice some growth, cut back to a little more once a day. At about 2 to 3 inches is when I start feeding every other day. Your turlte is still considered a hatchling at this size. At about 2-3 inches I would say he's a juvenile, and at 4-6 he's an adult, although females don't really reach sexual maturity until 6 inches.
Offering greens - Romaine, leaf lettuce, collards, dandilion, ect. - every day or every other day is a good idea, even if he doesn't eat them yet. You can also see if an aquatic/ponding center or plant nursery sell water lettuce or water hyacinth. They float in the water and provide a sense of security for the turlte, but they often eat it, too, and it's a good food.
Katrina
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"Thanks again for the help I did get some Calcium & Vitamin D3 dust this week and tried it today for the first time. I think I'd like the cuttlebone better and will pick that up the next time I go out. He loves live crickets (and earthworms). I was under the impression that the bones in the crickets helped with calcium??? I just hadn't been giving him any "extra" calcium until today. It says to coat the food once or twice a week. Hopefully this will be enough And now that I finally have the correct light he can absorb it as well! I appreciate all the info here! Very interesting reading for a newbie like myself
Denise"