Help Sick Fish!

[Schaumer]

Hey everyone
I have a 65g setup that has been running for 2 1/2 months. My tank is cycled and the levels are good. I came home today to find 2 clown loaches very sick and one just passed away. I'm not sure why they have gotten sick as every other fish in the tank seems to be more than fine. I'm alittle concerned as everything in my tank seemed good now I'm second guessing everything. Please help as I have no clue why only these 2 fish are sick I have 30 others that are not.

Help!!!!

 

[KrystaK]

Getting 30+ fish in a 65 Gal in 2.5 months sounds like it could be over stocked. You may have upset the filter by adding too many fish too quickly.
Sure it may have been cycled in the first month but with so much extra waste added so quickly you may have bogged down your filter.
 
Do you have a liquid test kit? If so, what are the readings?
What exactly is your stock? 
 
Also, describe the symptoms or get a picture if you could.