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That temp won't affect ick at all. Plus, 1.020 is too low. For ick, I would remove the fish, treat, and let the tank remain fallow for 8 weeks.
Anyways, did you make the sump yourself? If so, how (( did you use silicone? ))
What all do you have for filtration? Skimmer? Live rock?
Do you use RO/DI water? If so, what is the TDS?
That is a fairly large bio-load for a 55 gallon tank. As those fish grow, more problems will arise (( up to and including eaten fish ))
Did the hob filter have anything in it that would give bacteria a place to grow? If so it is possible that removing the filter removed some of the beneficial bacteria and it is going through a small cycle while the bacteria builds the population back up.
I find this interesting. I have a sump on mine as well with 2 clowns, large yellow tang, blue Hawaiian tang, royal gramma, orange stripe goby, coral beauty, red scooter blenny, green mandarin, emerald starfish, sea serpent starfish, coral banned shrimp, cleaner shrimp, purple reef lobster, carpet anemone, bta, frogspawn, ricordia, moon coral, polys, rastas, etc. No protein skimmer and they only thing that I have readings on is nitrate which I'm using prime. I do have live rock and macro

