It could be the tap water. You can get a ph pen online and have it mailed to you.
Ocean spray could be affecting them.. if they are right next to the ocean they could be getting misted with saltwater.
Could be the ocean forest mix is a bit hot for that one plant, or the ph is off. I would check the runoff next time it's watered to see the ph and ppm levels.
Yes, they are starving. Give them some food. It wouldn't hurt to get a ppm pen to read exactly how much food you are giving them, they only cost around 10 bucks on ebay.
I would recommend avoiding longs peak blue. The plant I grew had little white seeds all through the fluffy buds even though it did not get hit by pollen. It's one of the worst plants I've seen in awhile.
I use the floralicious bloom, the label says it's made from fermented seaweed and sea creatures. I wouldn't foliar feed with that stuff. I just add it to the water at the amount it says to.