I don't think boiling will help much, doesn't do anything your chlorinated water hasn't all ready done. Distilling the water would be good but hard to do without a "still" but maybe possible.
If you want to cheat use this product called chem-I-clean it will not hurt fish, shrimp, corals ect. I used it in my 47g reef tank with no adverse effects to any animals and I have a little bit of everything, clowns, shrimp, misc. hitchhiker crabs, pods
, worms, an anemone, acropora montipora, zoas, kenya tree, polyps, mushrooms, sponges, a sea urchin, and everything was in the tank and seemed unaffected. I was cyano
free in 3 days and have been for over a month now. Just Sayin.
I've heard it's a mild dose of tetracycline, I dosed my tank per the instructions for 40g so a slight under dose. And it was effective.