Ive had my 55g planted tank up for about a year now. I have a 48in Glo t5 lighting system on my tank with two power glo bulbs. I have been using flourish excel for about two weeks now every other day. For one, my plants do not seem to be growing like i want...i have had a whole lot of plants just die on me. I have a problem with green and black hair algae..the black hair strictly grows on my plants and slowly kills them. the green algae covers the glass, wood and substrate. I have tried everything i can think of. I do 30% water changes 1-2 times a week and i have to scrape algae every time. I have cut back feeding considerably, and my light is not on that much and i have it turning on and off throughout the day. What the heck am i doing wrong?