Don't know much about that filter and I couldn't find it at
Drs. Foster & Smith. Having a media slot that is generally used for a filter cartridge that has activated carbon in it is not, inherently, bad. But, I have no idea what the GPH rate is of that filter, so it would be hard for me to say whether it is good or not.
I personally like the
Penguin BIO wheel filters. A 100 would be fine for your 14g tank. Might want to look at those if you don't like yours, and it is quite a bit cheaper than $30.
