The Puffer Forum

PH 8.4 (held steady on that since inception)
Nitrite 0.007
Nitrate 6.90
SG 1.026 (will be reducing to 1.024 over the next week)
Age 5 weeks (cycled with ATM colony)
DP 350lts / Sump 75lts
Inhabitants Dogface Puffer & Yellow Tang (trading him due to bad advice)

The DFP developed a white thin line which started a few days ago around his gill - no other white spots that i can see and nothing on the Tang. Last night added 15ltrs of 1.024 mixed from RO water and, placed a few feeder shrimp - he ate quite a few and is looking a little fat this morning... However, that white line is now huge and weirdly flaps with the flow. I am fairly new marine and new to puffer therefore a little unsure after lots of internet searching - I'm hoping its just fat flap and nothing more?

Any questions let me know, all help is appreciated.

Second pic is before taken June 16

Before
After

Does it look like a fungus?

That was my initial thought, any advice on treatment... no reef just rock and a yellow tang

You could try Pimafix, which won't hurt your biological filtration but I'm not sure if it foams in SW.