Need help identifying red mini bugs that killed my Phal, please..

[titi_bradley]

Hello everyone! I`m hoping to get a little expert help from you. One of my phals died. The leaves turned yellow and then a few days later on closer inspection were completely rotten at the base. When I removed the leaves to examine what caused the rotting, I found miniature red bugs all over the base of the leaves.
I have 20 more phals and am worried they might get these same pests. Can someone help me know what they were and how to get rid of them? Or even better, how to avoid them please?
There are also plenty of healthy green roots left (see last two pics). Is it possible to save or should I just throw it out?
Here are a few pics of the critters...