Cycled Tank! (took 2 Months)

[A creature void of form]

Size: 15G
Dimension: 24"x12"x15"
Ph: 6.4
Kh: 0d
GH: very soft
Ammonia: bacteria munching 4ppm in less than 12 hours
Nitrites: bacteria munching it away in about 12 hours
Nitrates: 0 (100% water change yesterday)
Temp: 26 degrees

Decor: several plants, bogwood, rock structures and caves
Substrate: Very fine kiln dried sand
Lighting: 12 hours a day with a 2 hour photogap siesta

^ I take it the above is all well and good. Except maybe for my KH, but that won't be a problem. Right?

So here is my stocking idea:

2 Bolivian Ram chiclids (plan to add 1 male 1 female this Friday)
6-8 Cardinal Tetras (I will add these in about a month or so when the tank is more established)

AND THEN...?

Probably somewhere near capacity, but I would like another fish species in there, or maybe some other invertebrate.

Any suggestions?

 

[Amunet]

Hmm.. sand bottom, so maybe some type of cory? Or maybe a few kuhli loaches? Or any other kind of bottom dweller that would appreciate the sand substrate.