Here's a complete list of all fish added to the tank:
July 5: 1 clown, 7 damsels
July 19: 1 diamond watchman goby
July 24: 5 damsels, one died after a day or two
August 9: 1 damsel, 1 pseudochromis
August 16: 3 damsels, 1 blenny, 1 cardinal
August 18: the cardinal died, and two damsels died
August 21: 1 cardinal, died a couple days later
Sept. 1: goby jumps out, a bunch of other fish start dying/going missing
I checked the tank this morning, I'm only able to find 5 damsels.
The only things I've ever put in the tank as far as water and additives go are water conditioner, Instant Ocean, and tap water. No additives or anything like that.
I think twice over 2+ months I've rinsed out the mechanical filters on the HOB
part of the filter but other than that, no filter cleaning either.