Black Stuff

[Red Betta]

There seems to be some black stuff growing on the gravel. I put in aquarium salt every week when I change the water. Is this the bacteria that gets rid of ammonia and nitrate. Can someone help me/

[crowntail lover]

Uhhh....It might be algea.....How big is your tank, and do you have live plants??

[MrVampire181]

I have a similar problem in one of my tanks. Start doin water changes and it should clear up :)

[Red Betta]

The tank is 3 gallon, all I have in it is one female betta. I dont have live plants since the tank gets little to no sunlight. I will do more water changes and see if it helps.

[dr2b]

How long do you leave your light on everyday? My alage looked blackish, but it was really a dark dark green.