What Is Going On With My Plants?? Rust / Yellow Colored Spots Showing Up..Please Help

It aint a Ph Problem. Got some that look like yours. there fine!!! Nutrient problem if anything. I Use Promix BX

Thanks...I Will give that a shot... Because like u said OF is hot... i was just germinating then transplanting into OF and i started getting that problem.. i will try out what you stated about the happy frog... thanks