Am i stressing or is this an issue? lighter green blotches on oldest/bottom leaves

Hey guys and gals.
15 days ago i started a White Widow from seed. germinated it and planted in 1.5L ceramic pot in soil (20% perlite, 80% potting mix). I have been watering every 2-3days with aprx~750ml of water. Last week i started with some 7-6-5 houseplant fertilizer my mom had around as my FloraNova Grow/Bloom had not arrived. It has gotten one feeding of this about 6 days ago. Yesterday i noticed some lighter green blotches on the 2 oldest leaf sets. I have looked around and done many searches but cannot find a similar issue so i'm having problems diagnosing the problem... if there is one. Any help would be greatly appreciated

Peace PyspherE... Pack a bowl, Have a Toke

I'm growing indoors as well... thx for any help. Dunt know what ill do if i lose her ... lol

well im no expert, but if its only been 15 days since u started the seed, and you fed it with nutrients last week, it could be nute burn, again im no expert, but i know young plants don't need nutes for around the first 3 weeks or so since the cotyledons(small fat leaves you see when the plant sprouts) provide the nutrients in the early stages.
If it gets worse, id flush the soil with a few gallons of water and then give her a few days to recover.

I would go a head and flush her... looks like nute burn to me also... Just tank a couple gallons of water, run it through her and put her back and wait for her to dry to start regular watering then feeding. remember when you start feeding, just use 1/4 dose at first and work it up over a week or 3.

I was kind of thinking that but i have been feeding her staright water for the past 6 days and it has only been the last day or so ive seen this issue. I will flush just to be safe though. She only got a single feeding of the fert and at about 1/2 - 1/4 strength. She did take off after that feeding to grew like mad the past 4-5 days... Thank for the advice Hank, will flush and hope for the best.

kk will do that... thanks for the responses. i wasnt sure because it seemed very minimal