Fluorescent red algae?

[reefcadet]

I sure do like it but not sure if it’s good or not? It’s popping up a few spots around the tank

 

[Tired]

Interesting. Any pics under white light?

 

[samnaz]

Coralline

 

[jeffrey750750]

I've seen that in my tank over the past year usually little tiny red flouresent dots

 

[BloopFish]

Likely coralline like someone else said. Under high blues, a dying or scraped off coralline algae can look extremely neon.