Last night I noticed a slight discoloration on one of my L255's - either side of the front of the dorsal fin. I cannot see anything else, and the fish is otherwise (in my opinion) looking healthy. What could this be ? I'm quite concerned as I lost one of these within the first couple of days (2) of arriving (that was probably about 7 weeks ago now - and it had similar discoloration
I know the pic isn't that great, and it hardly seems visible, but that's the best I could do.
Nitrites 0, Nitrates 10, Ammonia 0, PH 8.2 (I know the PH is high, could this be it ?)
