Red dot.

[Stefernini]

Anyone know what the big red dot on the inside of the glass might be? I first noticed it a few days ago.

 

[Somykidswantedanaquarium]

Sounds like algae you can clean it off its not harmful if it is algae but I would check your ph levels to make sure nothing changed

 

[Stefernini]

Algae can form as a red dot? That's the only one in there.

 

[Somykidswantedanaquarium]

Yes it can

 

[Somykidswantedanaquarium]

It can spread too this is a pic of red algae as well just scrub it off check your ph level. Do you have a light schedule?

 

[Somykidswantedanaquarium]

Red algae

 

[Stefernini]

My Ph is a steady 7.8 and my lights are timed and are on 8.5 hours. I have two T5 lights and pressurized Co2.

 

[Somykidswantedanaquarium]

Well it's not harmful I would just keep an eye on it try to remove all the algae and turn your lights off for a day or two