What should I do?

[mark]

Ich shouldn't have to been part of a normal system but seems likely in a lot because we're lazy or careless.

Could go ich free by removing all the fish and place in a QT or transfer tank system then keep them out until ich runs it's cycle in display. Thing is that's going to be stressful on the fish, extra work keeping holding system and if you don't follow meticulous QT practices for absolutely everything in the future (not just fish) all your efforts would have been for nothing.

Should be remembered though, not QT'ing could be bringing in more that ich.