Kribs and GBR's?

No i would say that you are stocked now if you can convince your mom you need a 55gal then i would say yes to the Pisto's and no to the Kribs, Kribs can be nasty boogers..
 
if you had a larger tank i wouldnt see anything wrong with it. i currently have 3gbr's and 3 kribs along with 15 or so neons in my 55g. as long as you weren't planning on breeding them you shouldn't have any probelms. my fish do quarrell a bit but overall they get along just fine
 
Important FACT.

You cant understock a tank. Running a tank with less than the max fish just makes life easier. Keep 2 fish in a tank that could hold 10, and it's pretty much bulletproof.

Think of it like "How many cats can I have in my house?" Sure you can have 20, but then you are the Crazy Cat Lady. No one is surprised if you have one cat, why not have one fish?

If you are happy with your tank, leave it alone. More fish means you need to work harder to maintain the tank. Make a mistake and fish die.

Ian
 
I'm not sure about the kribs, but I kept a male GBR and a male Apisto in a 55gal with no problems what so ever. I just noticed the apisto would hang out in his cave a little more than usual after the GBR was added. No agression issues. Your 29 gallon might be a different story though.

-Chris
 
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