I'm looking for some suggestions for a light that will do well to provide medium to high light for my upcoming tank which is 16.9"L X 10.2"W X 23.4"High. 12gal I plan to use DIY CO2 in this tank. Plants, Various cryts, Java fern, s.repens.
Sorry for too many questions asked, but would like to start on the right track, while on budget 
do you think Asta 120 50 watt will be too much light for this tank if I don't have CO2 setup?
do you think Asta 120 50 watt will be too much light for this tank if I don't have CO2 setup?
What do you mean by DIY co2? If your referring to the yeast method then yes, that is way too much light.