Hello, I want to get some java fern in my tank but first I've got a question.. I have a 72 gallon tank with a 240 watt lighting system that is suspended above my tank making it 2.5 feet from the bottom of my tank also giving me 3.3 wpg. My substrate is play sand and I don't have CO2. I've heard this won't be a big problem from some people but I've also heard that it could be a problem. What do you think?
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