Big Problems

[SeanTrollope]

someone i know has a rainbow shark, two bala sharks, two guppies, and this . in a 10 gal. he is looking at upgrading how big must he get to keep all of them

 

[Fishmanic]

probably around 100  gal---the bal sharks  grow  very big---about 16 inches long

 

[eaglesaquarium]

Bala sharks get HUGE, not just big - and are very active fish.
 
Balas can grow to 14 inches long, and are active swimmers (which the name shark would suggest)
 
Honestly, in my opinion, anything less than an 8 foot tank is cruel, although a 12 foot tank would be my suggestion.  And 12 foot tanks are very rare, which is why I feel that bala sharks are a fish that really have no place in the hobby.  They just can't be properly housed in any reasonably sized tank.

 

[Ninjouzata]

I agree with Eagles on the bala sharks. They shouldn't be kept in groups less than 5 either or bullying can occur.
You can read more about them HERE. I would suggest your friend to re-home them, honestly.
 
The rainbow shark would be best in at least a 4ft long tank.
 
The fish in the picture looks to be a synodontis eupterus (commonly called featherfin squeaker I believe), which if what I've read is correct..it will also require a 4ft long tank (at the least, bigger would be better ofcourse).
I'm not sure how well the shark and it will get along as the shark can be a bit territorial (though not as much as the red-tailed black shark) and they both stay towards the bottom.
 
The syno may also eat the guppies once it gets larger.

 

[SeanTrollope]

ok he says that he is willing to rehome the bala sharks