Just being aware of the problem helps you keep an eye on 'em. Perhaps adjusting watering schedule would be a benefit, but that depends on local conditions, dry times, plant uptake...
I'd also transplant a tad early into their next pot, with perlite or vermiculite added to the mix. :thumbsup:

Peat is very acidic. Did you mix your own? (is the soil ph buffered?)

I've found it's easiest to use a commercial potting mix, rather than to mix your own. Consistent, cheap and reliable. (or they wouldn't be in business for long)