What tank mates can I have with a mini marble stingray in a 6x5x2.2 (l,w,h)

[Simonas]

I have a pair of mini marbles in my 9x3 tank and have an asian aro in there as well. Good tank mates as they dont bother each other . Aro's have more impact on tank mates as they can be feisty and idiots wheras the rays are perfectly behaved inhabitants
I also have a fire eel, Irwini cat and datnoid etc

 

[Beannose]

I have a pair of mini marbles in my 9x3 tank and have an asian aro in there as well. Good tank mates as they dont bother each other . Aro's have more impact on tank mates as they can be feisty and idiots wheras the rays are perfectly behaved inhabitants
I also have a fire eel, Irwini cat and datnoid etc

Do you think my tank dimensions would be okay or is the length not enough?

 

[Simonas]

Do you think my tank dimensions would be okay or is the length not enough?

Hard for me to say. My pair were too small in a 6x2.5.2 tank as the tank was too narrow, your tank is almost square so will probably be ok but I cant say that from expeience of having that shape tank