What filter should I add?

[Deaths Sting]

I got 2 AC110s on my new 112, the stock is going to be:

- 24 Maylandia callainos
- 24 Labidochromis caeruleus
- 12 Synodontis eupterus

What filter should I add.. Id rather not spend a lot

 

[aclockworkorange]

If you prefer to keep the ACs then I would suggest a mid size canister.