Yes, tank is fishless and fallow for 76 days because of Ich.
I am feeding the tank because of my inverts but not as much as when I had fish.
I do not have macro algae, it would never grow.
I am still running my skimmer as normal based on benefits other than lowering nitrates such as aeration and phosphate removal, and to be honest I just cant bring myself to unplug it!
I cant explain why some tanks have trouble reducing nitrates and some creating them but I fall into the later. I have tried not changing filter socks until they over-flowed, feed 3 times as much as my fish could eat, and going longer between water changes and still not get any trace of nitrates.