Awesome! So glad to hear you're turning the tide, so to speak, on hair algae. Sounds like you may be ready to remove some chaeto, for nutrient export. Two water changes - that must've been fun, as big as your tank is. Thanks for all the pics. It's great to see your fake wall showing through again. Seeing your fish makes me want fish!
You really are dealing with the 'ultimate challenge' for aquarists. I salute you!
I had a thought, that might help with your bug-situation. Filter socks. Maybe put one on the discharge of your overflow into your sump. I wouldn't normally recommend them, because they'd need to be changed daily, but since you get so many 'guests' everyday, you might add it to your daily routine. Have two in rotation, with one working and the other getting cleaned/drying.
It's a thought. You've probably already thought of it. I was just thinking, if you could attack the 'source' of your nutrients, it would help. Will it be an issue in the winter months? If not, you could take a few months off 'sock duty'. I wouldn't be surprised if you'd need to remove some urchins soon, so your herbivorous fish don't run out of 'pasture'.
