Not sure if my fish is okay

[N56]

I have a yellow glow fish. I’ve had it for a year with 2 other fish in a 8 gallon tank. Recently I got 1 more glow fish which sadly died within a week. I have just noticed that it had a little black thing on it and under him is like green. I changed his food from omega one super color flakes to glo fish special flake food. I like my fish a lot and am a bit worried for it.

 

[N56]

I put photos

 

[Lucille]

The black spot looks like ammonia burn maybe... Do you have a way to measure your water parameters?

 

[N56]

Yes I have the 5 in 1 tab I can check right now

 

[N56]

The black spot looks like ammonia burn maybe... Do you have a way to measure your water parameters?

I think I put the image

 

[Aiken Drum]

You need a seperate test for ammonia. It isnt included on that test strip.

 

[N56]

Oh I will go to petsmartlater