I have a 29 gallon tank with four juvy pirahnas and a couple of plants (Amazon swords) Currently im using regular blue gravel and a 18 watt bulb.. Been running this for about a year no problems but minimal growth in the plants..I want to change substrate over to eco - complete but this seems impossible without tearing everything apart??.I also want to upgrade to a power compact lighting system but Im not sure what brand to buy as i have seen prices vary anywhere from $$50 - 150..Im looking to get lighting about 2watts per gallon so my swords will take off... my tank is 30 inches long..the current hood is approx. 29 inches long - reg. flourescent....I would just like to hear ur guys suggestions on a good deal on a power compact lighting fixture and any other worthwhile suggestions....