With Photobucket, just click on the bottom of the four options under your photo - it starts 'img....', it will say 'copied' then you paste this into the forum and you get the picture coming up, not just a link.
Be careful with the Flourish Excel, if you have catfish such as bristlenoses, or fish without scales, they do not handle shock doses of this fertiliser very well and I would be wary of using it in large doses if you do. If you don't have any scaleless fish, you should start with a couple of normal doses as per the instructions, then you could try a double dose.
The lighting period you have does not seem excessive, our lights go on at eight in the morning and off at ten at night. Are your tanks close to a window, direct natural daylight can cause some algae problems too.
HTH