Well, this is a work ongoing....
I have done something that I'm not happy with but I needed a quick fix while I sort it out. I added a chemical phosphate remover resin to the filter. I don't like using chemicals if it can be helped. I've reduced the lighting period by one and a half hours to only seven and a half hours also. The problem has reduced but by no means gone.
What I do intend to do is do a thorough cleaning of the gravel in all those places that I don't normally do (inbetween plants etc.) to get ride of any excess organic waste that will have built up there. I'm also trying to get hold of a phosphate test kit to check my tap water but haven't been able to find anything yet.
With what I've done to date the rate of algae growth has reduced by about 50% With a bit of knowledge, luck and patience I should be able to near enough erradicate this stuff from my system without resorting to more chemicals. I intend to remove the resin as soon as the algae is under control.
WK