Hey Qshark. Sorry to hear about that blasted parasite called ich!!!!
I was thinking the other day, what would I do if my system got ich again. I thought to myself, probably give up. It is hard, especially the water changes, but my advice to you is dont give up. There has to be some logical explanation for the outbreak, again. My best bet would be the sand, but what do I know anyway.
I am truly sorry, but you can do it, and you will do it! We are here for you. I wish I lived close, I would take half your fish through the qt
for you. Well, keep us updated.