[Can I keep Spotted Raphael Catfish (Agamyxis pectinifrons) at temperature of 82?]

I would like to have a tank with 3 clown loaches and 1 or 2 Spotted Raphael Catfish (Agamyxis pectinifrons) with some smaller fish.  However, I know clown loaches like their water in the high 80's if possible.  But the Spotted Raphael Catfish likes 68 to 79°F and I figure the middle ground would be 82F if possible.  Since the clown loach could technically go temp: 72-86.  Just asking if this would be okay since I'm still in the research process and need to still find a 75 or 120gal tank.

[Question about a 75 Gal and the choice of fish I would like.]

Since it's hard at the moment to find a 125 gal tank around my way and the LFS that could try to "order" one wants double the cost.  I rather get a 75 tank that's available at another store and  I can get my hands on right away.  My vision is to have 3 Clown Loaches and 3 Peacock Chilids.  This will include a lot of live plants, moss, driftwood and a pleco.  Is this doable in a 75 gal or too small overall?

[assassin snails or a couple of yoyo loaches?]

Thanks guys for all the information, I don't want to completely eliminate the population since the snails do have a job and contribute to the well being of the tank overall.  

[assassin snails or a couple of yoyo loaches?]

Would hate to do this but what do you guys think. Either 1 or 2 assassin snails or a couple of yoyo loaches for a healthy balance of snails in a 29gal tank. I have right now over 50 snails of all sizes. I feel bad wanting to kill them but the bladder and ram horns are multiplying pretty fast. Only one I wanted were my trumpet snails lol. I am feeding a little more than usual but that's because of the new fries in the tank. All I want is a balance not completely eliminate them since they do have a purpose.

[Strips or API master kit readings? Which one should I trust.]

So curious which one should I trust. Co-op strips shows 6.8 but could be 7.2 PH. But master kit shows 7.6-7.8 PH