I'm using the Amazonia II in my CRS tank. When I first set it up I noitced an ammonia spike, but I never had a problem with cloudy water. I am, however, using RO water. So far, I really like the stuff.
L046 (Zebra Plecos) 3M/2F + Juveniles
L144 (SF Blue Red Eye BN Plecos) Juveniles
L134 (Leopard Frog Plecos) 1M/1F