Chloraminated water is almost as toxic as chlorinated water, it is safe for humans to drink, but burns out fish gills almost as easily as chlorine does.
Using a dechlorinator with a sodium, or calcium sulfate base will almost immediately neutralize it.
There are liquid and dry forms you mix up.
With only a couple tanks, the liquid form is practical.
I had @ 1,000 gallons of tanks, and two ponds, totalling another 2,000 gallons, so I used the dry stuff, much more economical in the long run, so i would buy 5 gallon buckets of dry, and mix it because of my every other day 40% water change schedule.