One more angelfish has died.

I have increased the PH to 6.6 (by lowering CO2), withheld any Epson Salt and no Excel, but continued with the fertilizers as usual. I had ordered and installed today a UV sterilizer to help fight my green algae and diatoms, etc. Tired of seeing a cloudy tank. Don't think the UV has had anything to do with the improvement; it's been there too short a time.

There is an almost immediate improvement in all the fish behavior. More active, coming out and moving around, etc.
Three angels have still been at the surface (one of these died) and still wont eat.

One of the angels is mix breed (koi type?) and I can see a new redness in the area of what I would call the lower jaw of lower mouth. Very distinct and clear.
This fish is a little transparent in this area and I, and my wife who first noticed it, can relate this to and irritation of the throat. What I would call a soar, reddish, on both sides. The area is about 1/8 " and kind of circular.

For your opinions, etc

regards,

raul

P.S. The water is clearer now and I can that I am sure the red area mentioned above are the gills, very red.