How Much Light Am I Really Getting?
I was wondering, if I have a 20G tall tank with 48 watts of light over it, that equates to 2.4 WPG. If I have 3 inches of substrate doesn't that decrease the water volume of the tank? And wouldn't that increase my WPG? I mean, I am not going to get 19.9 gallons of water in there; so when I calculate WPG, shouldn't I consider the area displaced by the substrate?
Plants are also classified by their light requirements, low, medium low, medium, medium high, high, and very high. I've read that below 2 WPG is low, 2-3 is medium, and above 3 is high.
Am I over thinking this, making something simple more complicated than it needs to be?
Just trying to get it right. Selecting suitable plants for the parameters of my tank.
Feel free to opine. Thanks, Joe
20 gallon tall
48 WATT T5HO
AquaClear 30 Power Filter
4 peppered corys, 12 H. Rasboras, and a pair of cherry barbs
1 java fern
* Will be upgrading substrate and adding DIY CO2