Used unfiltered tap water to wet my millipede's substrate. Will it be harmless, and do I have to get new substrate?

[princeharkonnen]

So I have a 10g with 6 inches of a combo of Josh's Frogs Millie mix, The Bio Dude calcium-enriched substrate, and sphagnum moss. When I initially set up the enclosure, I didn't know I should filter the tap water before adding it. I live in DC so it has a normal amount of chlorine and chloramine for city water. I have three Narceus Gordanus that have been fine in the enclosure for almost a month, although strictly I don't know how they're faring since I rarely see them.The last time I saw one was probably two weeks ago.

I just added two healthy florida ivories and I wanted to know if I should bite the bullet and just completely re-do the enclosure with filtered water? I would be very upset if they died. On the other hand, digging up the Gordanus to do this could also be dangerous.

Any advice?

 

[Polenth]

Chlorine disappears quickly. Chloramine does not. Get a dechlorinator intended for fish or reptiles. Add it to the water you use to wet things down. Keep that up for a bit. That should break down any remaining chloramine in the tank.