curling

hello just a quick question and to see if some one could please help me, my plants have just gone into 12-12 but my leafs are curling i was useing miracle grow and giving this to my plants twice a week but changed to bio bloom a few days ago, i have used it twice now, i had a little curling of my leafs but im sure this started before i used any mg or bio but my leafs have always been a nice green and the plant its self is growing nicely and getting bigger all the time, but the last few days they have started to really curl up all over it, was only a few leafs before now its quiet alot of them and a few leafs have brown spots, im useing filterd water i water every day but am i giving them to much water or not enough or to much mg or bio all answer would be very greatful all so my white dwarf have a little yellowing on the tips the other plant with the curling is a four way i feed and water all plants the same but white dwarf has no curling. useing 600w sunmaster temps are perfect they go between 75 and 80, 65 at night .

Depending on how much your watering, everyday seems a bit much, if you don't have a moisture meter i know alot of people say to stick ur finger in the soil about 3 inches into the soil to make sure it is dry before watering again

Sounds like you have salt build up, you need a good flush maybe water with hydrated lime to stabilize the PH. You'll probably start to see some necrosis, spots signs of both under and over watering soon if you dont

also im useing bio bloom on the bottle it says to use every day im guessing this should not be put into practise i used 2 days in a row and thats when the curling got real bad, ill give it a good flush, if this is the problem and it needs a good flush how long will it be until i see a change, and apart from the curling do you think my plants in the pics look ok