Man, Damsels get such a bad rap ...
Depending on the condition of the LR
, cure/uncured, you might not see a huge ammonia spike but you could also see a hellacious one. Definately test for ammonia and adjust you water changes accordingly.
I don't advocate using damsels to cycle but when I started out in the hobby 11 yrs ago, that was all anyone did. I can't imagine adding 8 damsels though. Might be better to remove them now vs later. I have 2 in my tank and I like them. Would not want 8 though.
*180 gal Display, 100 gal basement sump, 33 gal refugium, 3x250 MH, 2x160 VHO actinics, zoos, some softies, LPS & lots of acros and other SPS.
*100 gal prop tank plumbed into main system w/ 2x96 PC lights and 1x150 MH,