Hi,

I installed AST in a bucket it's not white but covered with reflective cover inside and 4x flurocent bulbs of 28 Watt 1250 Lumen each one. ( two on each side).
The screen width is 10 inches feed by 500G/H pump, the flow is wide and steady as I saw in one of teh pics that Santa Monica uploaded.

However there is only little growth of brown algae, in front of the bulb where teh light is stronger it grow even less. the water temp is 26 Celsius and I don't use a fan.

The Nit is ~200! I assume the phos is also high but I didn't measure. I even brought some algae from the sea but nothing yet it's running two weeks.

What is wrong?

Thank you