Filter sufficient enough?

[Anna94]

I currently have a Fluval C3 but am wondering if it's enough filtration for my 29g tall. Right now I have 17 fish (lemon tetras, cardinal tetras, Celebes rainbows, a horseface loach, and an oto), but I plan on adding 5 green fire tetras if my lfs gets any in, 4 more otos, and maybe 1 more Celebes rainbow. I have the foam/poly pad, Purigen and Matrix in the filter. I feed once every other day and I do weekly water changes and gravel vac during each water change. Is the Fluval C3 sufficient enough?

 

[Barliman]

Seems like a lot of fish to me for a 29, but I'd look to your water parameters to answer that question. When you test the water, what do the readings look like?