Juz to clear some doubts, here's a brief history...
- Everything fine until intro AT n PBT into main tank...
(All other fish, inc. blue tang, r hypo-ed b4 going into main, but AT n PBT r quarintined for 1 mth without hypo since they looked ich-free)
- Ich infested AT n PBT...rest of fish minor infection inc. blue tang
- Hypo main tank
- A week later, all recovered from ich
- 3-4 weeks into hypo, blue tang developed wat I tot was "stress spots" due to on-off chasing by ABT (all other fish r 'clean')
- checked NO3... 80ppm!!!
- water changes, ABT sold, 20ppm......but spots still there, if nt more....