Small discoloring concern... Help

Spotted this on a couple of leaves this morning... i did a three gallon top off yesterday at about 25% strength any and all help is greatly appreciated..
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ANy advice ?

need more info. Type of nutes, PH, flower or veg? Is it just on the lower leaves?

i notice this on my plants that get pretty dense and large when vegging under t5's. floro's are great for veg but don't have the best penetration so some of the lower leafs tend to die off, as long as it doesn't become a real "problem" which your plants look healthy to me i wouldn't worry about it to much.

Looks like good ol' nutrient burn to me.