Platy Fish Bleeding?

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Registered Member
Original poster
Nov 8, 2019
Hello everyone,

I would like some community opinions as to what is happening to one of my Platies (see pic). This just started happening a few days ago (no changes have been made to the tank during this time)

Tank Size: 29 Gallon
Planted Tank: Yes
Food: Tetra Tropical Flakes. Fed twice a day (small portions)
CO2 Injected: yes
Lighting: Fluval 3.0
Filtration: Fluval 306 Canister Filter
Water Parameters: 0ppm Ammonia/0ppm Nitrite/20ppm Nitrate
PH: 6.8
GH: 200
Fish in tank: 5 Platies, 1 Dwarf Rainbow Gourami, 2 Ottos
Fish agresssion: little to none from what i've seen
Had the tank for: 6 months
Medicine: All fish were quarantined and treated for ICH (IchX) and Parasites (General Cure) when I purchased them 6 months ago.

The fish in question is currently swimming around with all of the others and eating food normally. But the red is getting worse. I cannot figure this out and I dont want to lose the fish. Any inputs/ideas/things I should try would help me a ton!

Thanks in advance!