What a gorgeous setup. You DON'T need to change anything in it now - keep it as is. All is NOT lost.
I feel like so many people have told me different things and I don't know who is right and who is not, and it's just really hard. I guess I really just need someone who lives near me who is successful that could help mentor me because I obviously screwed up majorly here and I don't have any way out right now.
Sure you do. You get can pick up a 10 - 20 gallon quarantine setup right now for short change. A small, basic one. That's ALL you need!
Here's what I would do:
1. Buy one with a light, heater, filter and pump.
2. Get some salt water made up (NOT from your existing tank). Bring it to a saliity to about 1.025.
3. Spike it with bacteria. Can get a bottle of it cheap.
4. Put ALL your fish in there. Leave everything else in your DT (corals, inverts, etc) ALONE in there. The ICH CANNOT feed off the corals. It will DIE in the DT without fish.
5. SLOWLY bring down the specific gravity (over the course of 24 hours) to 1.008. (Take out some water, and replace it with FRESHLY made DI water).
6. Keep it there for SIX weeks. Keep your siphons, nets, syringes, etc that you use for your QT tank SEPARATE from your DT equipment! Avoids contamination. But do weekly water changes on your QT, keeping the SG at 1.008.
7. During this time do regular water changes in your main big DT tank, and feed your corals and inverts as you NORMALLY would. Take care of them!
8. After six weeks, slowly raise the specific gravity of your QT over the course of SEVERAL DAYS.
9. Keep the fish in there a week after you have finished that.
10. ICH in the DT should be gone by this time (10 weeks) if you DON"T add ANY more fish to it!
11. Should be safe to put your fish in QT back in your DT! VOILA! BYE BYE ICH!!