Glofish Tetra -black spots?

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LetItSnow

Aquarium Advice Newbie
Joined
Dec 14, 2014
Messages
8
Location
Oconomowoc, WI
Hello: I have a glofish tetra. the black spot on bottom of dorsal fin has been there since I got him 4 months ago. Seems to be getting slightly bigger..and a few spots showing up below on body. Seems to be generally ok...maybe a bit more reclusive. Hope picture helps. Tank info:

16G wide screen
Tank new in Dec 2014
Aqueon 30g filter/200 gph
Use purigen bag added to filter media
Added diy type co2
Planted tank

4 glo tetras
4 glo danios
5 scissor tails
5 neon tetras
5 ghost shrimp.

Yes, probably a few too many fish..which is why a run a bigger filter.
I do 30-40% changes every 2 weeks.

ApI test kit as of today:
AmmoNia : 0 ppm
(Thought this may have been ammonia burns but reading ok?)
Nitrite: 0 ppm
Nitrate: 10-20 ppm

Not sure if this is something I should worry about...or try to treat?? Or is this a known issue with glofish??

Thankss in advance!!




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And here is the pic...sorry!

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