Help!help! !st time grower needs info

it is my first grow and i recently purcahsed a clone and i put it in my powergrower i ran it off cfls for a couple days and then went and bought a used t5 it has 4 bulbs and it 96 watt is this a light i kan use during veg and flower and get a good harvest??is it a good light at all??also i bought it and it came with 2blue spectrum bulbs and 2 red will this make any difference during vegging??my leaves are starting to curl p and my bottom leaves have turned brown and died, i see lil shades of yellow in sone of my leaves does anyone know what the problem is???and if anyone knows how often i need to change the water in the power grower please let me know??what is my basic tools i need 2 take care of my hyro system and make sure all levels are right??also is my light to far from my plant??please inform me off things im a noob and really need help...i posted pics check em out

by the way im growing in my garage and the temperature in here is around 77 degrees...

also kan it be my ph? what can i buy to fix it

get a ph meter. i never change my res the whole grow. cut youes down to a 1/4 strengh. and get some h2o2 and add it any time you notice ph swing

damn keyboard cut your nutes down to 1/4 strenght