I have set up a 10 gallon tank for quarantine , but it just does not look big enough. The small amount of water should help with medicating,but it may not habdle bigger pieces
It's my opinion that, unless you're only going to be quarantining the smallest of juveniles or only those animals and specimens suitable for nano systems, 10 gallons will ultimately prove to be too small.
I will strongly suggest spending a bit of money on one or two of those Rubbermaid tubs. You may not get the personal joy of viewing from the side, but in q/t (or hospitalization) this is not imperative. I've actually found through the years that I can get a better idea of which fish are sick (especially when having to check large numbers quickly) when viewing from above.
Your only worry with using such a tub is that you don't want to let the heater rest on any of the interior surfaces. Bits of PVC will help with this. Btw, these tubs average around 30 gallons, a much easier number to work with (especially with larger species).