Rummy Nose Tetra 10 Gallon

[Noahsfish]

So I have a 10 gallon aquarium thats been set up for about 2 months now. It currently houses 6 harlequin rasboras. I have driftwood and plants in the tank with gravel substrate. My question is would 6 rummy nose be able to live in a 10g longterm comfortably? I'm very diligent about water changes, light hours, etc.

Also, as an off topic thing I have one more question about a different tank. If anybody looking at this thread happens to know much about apistogrammas and their general behavior I have a few general questions. The tank I was considering putting a pair in is a 20g with 6 cardinal tetras, and 5 sterbai corydoras. Would they bully the cardinals? The ph is 6.5 and the water is fairly hard. Would apistos or German blue ram be better suited for my tank?

 

[TallTree01]

They need a 15 gallon to do well. They need bigger schools as well tbh. I'd get more harlequins instead.

 

[fluttermoth]

Rummy noses are a bit big for a 10 gallon, tbh.
 
Definitely not GBR for your other tank; they really need very soft water to do well. Apistogrammas, or Bolivian rams should be fine; they won't bully your cardinals, although they might chase your cories a bit.