Would a four bulb,4ft fixture be sufficient to grow glosso in a 55 gallon tank? I'd like the carpet effect. Ive seen that four bulbs is considered too much light on the chart I've seen floating around the site but I have my doubts on the depth of a 55. With high light plant none the less. Looking for advice from the vets on this one. Co2 is in the near future, not starting the tanks with it. Black blasting sand is the substrate. Osmocote imbedded in the sand. I wrap a scoop of it in coffee filter paper and shove it in there. Thanks for any input.