ok , if u have a tank w overflow , cant u just add a light to shine in there to get same effect? i have alot of algea on the wall the water falls down on its way down to my sump , i have added reef bugs to my 55 gal tank mos ago , still have not seen any , i have a friend with a 24 nano , about 1.5 yrs old got all kinds o bugs in filter and tank , he does NO maintnence , i did a 4 gal water change other day , first time any water changed in a year
, tank and corals r very healthy ,anyway just wondering about overflow spot on tank , maybe add a light and a screen ?