Hi Terryz,
my tank have been up and running for 3-4 years already, no much corals only bubble, blasto & anemone as i dont have the time due to travelling. Recently i realise my snails is dead and the sand bed is cover in brown algae. This algae does not have bubble on it. Did a major water change and increase my Vortech mp40 to the max on short pulse mode too. I added NP Biopellet on a separate FR when i do the major water change about 1 week ago too.