Thanks for the advice Ari. I understand what you say. Yes, I'm using PL lights. What to do? Invest already. Can use it later when I set up my 3 feet tank. And it's got a 2 feet height.

The thing about small tank is, my wife's 1 footer shrimp tank is totally algae free! Using a hang on filter and 2 x 9watt 6500K PLS. I guess mainly because the lux is not that high and shrimps have far less poo. Her plants generate a steady flow of bubbles too.

She always cha me - 'wah, hi-tech tank some more got algae one...'

Apart from switching back to FL lights (max 24watts available I think), what else should I do to try and correct what I have?

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The nose runs and the feet smell - go figure
Steven