hi ThRoewer, awesome idea, I hadnt thought of that.
I want to make sure I understand what you're saying though. I should take my Chaeto, grab a few strands (10?) and put them in a container, but be very aware of their growth. Let is grow for a week or 2, then clip off the newer ends that grew, put them in their own container, and grow just those? You said 'keep them in another container for 48h to let eventually present tomites die off' which is confusing me a bit. Are you saying because on my current chaeto, I may have ich in cyst form, but that wont be the case on the newer ends?
What's the best way to grow Chaeto if it's not in a tank / in a small bucket/container?
Also, regarding your last point - what do you mean from a piece that came with an algaegen tisbe bottle? How were you certain that piece didnt have ich? Are you saying that you bought a bottle like this -
http://blog.marinedepot.com/2011/05/product-review-algagen-reefpods-tisbe.html - and it had the chaeto in it for the pods? How did you know it was ich free? You're just assuming it was in isolation over 70 days from manufacturer?