Suzanne said:

Thank you everyone for your advice. I removed the affected leaves and
the plants seem to be doing fine.

Does anyone have a good fertilizer suggestion? There seems to be too
many options.

Well, for seedlings I like the fertilizer sold by Gardener's Supply Company:

http://www.gardeners.com/Plant-Healt...ouseplants-8-O
z/default/31-279.prd

without line wrap: http://tinyurl.com/rmusn

In the garden I use Espoma's Tomato-tone and Maxicrop for a foliar
spray. (Maxicrop is made from kelp.)

--
Pat in Plymouth MI ('someplace.net' is comcast)

Any technology distinguishable from magic is insufficiently advanced.
(attributed to Don Marti)