I bought this light fixture from a coral store in Tustin. it has two 28 watts in it right now. so, 56 watts total. right now, i have it on my 20 gallon tall. with a toad stool and a bubble tip anemone. do i need to upgrade to a more powerful lighting? I was told by a lfs that this light fixture would work for my tank. please give me some input! I was plannin to have soft coral in the tank.