My green water wasn't anywhere near as bad as not being able to see 2inches into the tank. When looking front on the tank looked nice and clear, but when viewed from the side you could barely see the other side.
I do have root tabs in my substrate which i used for my sword plants in my old setup. I thought it'd be best to keep them in so that they may help the Glosso along. Then when i've disturbed the substrate to bring some laterite nearer the surface this may have disturbed the root tabs.
I did a 50% water change before the blackout and will do the same when its done. I also cleaned the filter and scrapped any visable algae off that i could see. 4 days !!

Oh well im pretty busy at the moment anyway.
I'm going to order some algae busting plants tonight which should arrive on thursday, any recomendations? In addition i'm getting some Riccia and hair grass to help make the rocks look more natural in their surroundings.
I bought some christmas moss last week but I didn't like it and it was infested with snails so i just binned most of it
The only reason i thought it was my Phosphate levels to blame was because i had been dosing my nitrates all week to gradually increase the level to 10ppm. Everything was looking good, plants were pearling and algae was minimal. When it reached 10ppm i began dosing Phosphate, the day after dosing so my water was green.
But like you's have said its probably a combination of multiple factors, too much light, low plant bio-mass, root tabs being distrubed etc
At least its good to know my phosphate levels are ok and i dont need to tamper with them. I'll post back on Thursday with my new algae busting plants, clear water and hopefully healthy fish.
Thanks