Is it ok if the betta tanks don't have gravel?

[Flatcoatluver]

The bacteria is only useful for a cycle.. but unless your tank is 5-10 gallons or more (10 gallons or more preferred), it's useless trying to get a cycle. For anything smaller than a 10 gallon, very little could cause the cycle to crash and make it an unstable environment for the betta.

ok got it. I wasn't quite sure, I read it in a book so i guess they were referring to a bigger tank.

[dogzr#1]

Thank you! I am getting tired of cleaning the gravel from all of my betta tanks.