Like I always thought the difference between high and low is the lighting, but people talk about needing C02 in high techs and not in lows and different nutrient things.
starting to get confused.
From Super Low-Tech to Super High-Tech there are no hard drawn lines. Everything comes together to determine how the tank functions. Below a certain amount of light--you probably
don't need C02. But setup 10 identical tanks at that lighting level--and some
will need C02, some
won't. Where that lighting level is--depends upon all of the variables of that particular tank.
Whether or not your low-light tank will need C02 or not--is something that the tank will have to tell you. We can only guess. What size tank, watts, type of light and reflectors, substrate, plant types, filtration, tank flow, etc consitute the variables.
If you give us unspecific information--we will give you unspecific answers:
It comes with two T-8 bulbs inside I believe each are like 48 watts or something like that.
"or something like that"? I don't think they make 48 watt T8 bulbs that would fit over a 77g/75g tank. So, if they probably aren't 48 watt or something like that--how about you find out? Light is the driving force of the system.
Same with the T5: We don't know the length of the bulb or the tank--how should we know what wattage it probably
If you want help--then help yourself by helping us. Give us proper information and we'll give you the best answers that we have.....