yeh need a better pic . all i can say from this pic is you have one of 3 things 1 ph fluxuatoin. 2 , over nute at an early age. 3 under water . or all 3 but as i say you would need better pics and a better explanatoin of your set up and routine to give a proper cause , anyway hope this gives you some ideas to bounce around and any what do i know im wasted lol. the postman.