Sodium Thiosulfate will not remove or neutralize chlormines, and it only lasts in liquid form a few weeks.
Carbon is not a good source of dechlorination, it removes everything from the water, bad, good, everything. All nutrients that a nice water change provides to our glass pets, is removed by the carbon. Hole in the head is linked to the use of carbon. I would refrain from using it even if you have been for many years, the negatives out weigh the positives 100 fold. Carbon should only be used to remove odor and medication, and these can also be removed by doing your do diligence and frequent water changes.
I use Seachem SAFE, same as Prime but in powder form.