your temps are on the high side of acceptable so, dont worry about that. the pic you posted 1 page back looks like a nutrient burn. adding nutes to your water with FFOF at the same time was a bad idea. You could flush but, i think at this early of a stage you would just be substituting overwatering for burn. you are between a rock and a hard place because of this. if you have some soil without fertilizers added to it you could try an emergency transplant. if you are going to use liquid nutrients you really should not have to worry about fertilizers in your soils anyways. and vice versa. if you use fertlized soil, you really dont have to worry about liquid nutrients. unless you start to see deficiencies forming.
best of luck to you my micro grow bro and sorry i have not said hi in here sooner.