frothy starter

I've done the searching but I can't quite determine based on what I've read if I'm starving my poor starter.

I keep my starter on the counter.  I use it every couple of days.   Recently I was feeding it on a 2:1:1 twice a day.   It grew very quickly and started becoming foamy in advance of the next feeding. 

I then read that that is not enough so I switched to 1:1:1 and now the same thing is happening.   BUT I've also read that feeding it too often will dilute it.