What color is the Rummynose's nose? Is it a bright red? Those are good canary fish for the tank.
What are your water paramaters? temp?
What kind of filter do you use?
When you got the fish, did you do a fresh water change prior to the fish being added? If not did you do any water change during that time?Was this fish wild caught? or tank raised? - that plays a huge part in it as well.
my bet is stress related from the PH difference as Plant Keeper suggested +1.
How did you bring the fish into the tank? If they are cories you can drop them right into the tank, and they will be fine. However with the Rams, they need TLC. When I brought my German Blues to my 55 gallon, I did a slow drip of 3 hours!!! I went a little overboard, but I know how sensitive they are. Granted, the PH difference is huge and regardless of slow drip or not.... they will still do that.
Oddly enough, they like lower PH water....
Also, what size tank do you have?