I use pure ammonia in a fish less tank to start the cycle. BEST way to cycle a fish less aquarium.
Of course a teat kit is suggested. I can't remember exactly how much ammonia to use but it works amazing. Using the test kit in less than a month the aquarium will be perfectly ready to introduce fish.
Sounds crazy but it works. You can buy ammonia at Walmart.
I'll see if I can find the link
Do anything you can those turtles need help badly.
Your teacher is an idiot!!!