As a human being i expect you to gutload yourself every day, don't you?
What do you think will be the foodvalue of your (daily) excrements?
So if you can't do without crickets for food, you'ld better dust them with
an appropiate supplement. I, with all respect would skip the crickets and change the main menu into earthworms: no more "swimming in circles", no more "cloudy eyes",
no more "red legs", no more..................
What about the environment they live in. Size? Temperature? (get rid of the heather!).
Lighting? Size of waterpart? Ventilation? Soil? Hidingspots? Etc. etc.
No use for bottled water: just tapwater and leave it in a bucket for
some 3 days before using it, cheap and easy and good enough.

regards, Han