New and need some help

I think you could add a couple more of each (except for the betta), but I would not do the tiger barbs in addition to that list. I'm not sure if you meant that or not :D
 
so I could put:

8 guppies
6 platies
4 otos
1 female betta

and this would be fine for a 29 gal.?? AWESOME! I might only put 5 guppies in just in case there are babies. How many is too many for this tank?
 
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