2) Tank size and a list of ALL inhabitants. Include algae eaters, plecos, everything. We need to know what you have and how big the tank is.
40B with a 20 gal fuge sump. 2 tom clowns, one diamond goby, and my little gsp (3.25 in)
3) Feeding, water change schedule and a list of all products you are using or have added to the tank (examples: Cycle, Amquel, salt, etc)
feed - Tank gets krill, mysis, brine, emerald entre, and clams on a random rotating schedule. Puffer gets some of the freeze dried krill snacks as a random feeding. Flake food, spirulina, and the green nori sheets are fed semi regularly also. Most flake or pellet food is used to replace one of the other items if they are gone. Occasionally rods food also.
Products in tank- Started dosing vit c., trace elements occasionally (every other week 5 ml.), reef crystals salt, prime to treat top off water. Water changes done via RO from store.
4) What changes you've made in the tank in the last week or so. Sometimes its the little things that make all the difference.
Started dosing Vit C last week. Installed the overflow to the larger sump last week, prior it was a hob cpr fuge. Puffer did decide to take the overflow for a ride the day it was installed. I didn't notice any damage the day of, but was gone for a full day this weekend. (Left friday evening, returned sunday mid-day) Noticed the blister when I returned.
I noticed today one of the tom clowns is defending an area pretty strongly, could be a bite?
5) How long the aquarium has been set up, and how did you cycle it? If you don't know what cycling is read this: Fishless Cycling Article and familiarize yourself with all the information. Yes. All of it.
Setup in this location for 9 months, setup has been running with a pair of relocations for just over three years if my math is right.
It looks a little different in person, there is a whiter spot in the center of this. It looks like an abrasion of some sort that got infected, more so than a b;ister. He/she is eating very well, though I see it laying in new spots, but that is not soo unusual.