A PAR of 80 is high light. To use that much light you need to use non-limiting fertilizing, and CO2 adjusted to the optimum bubble rate for your set-up. Otherwise, you are just inviting algae, especially BBA, to begin growing.
Hey hoppy, i have been in the hobby for almost a year now. I looked at your par chart early on and had a hard time understanding it. Now after some time i revisited it. Im Upgrading to a 75 g tank And wanted your opinion on lighting.
i was thinking of going with the aqualife 4 x 54w t5 ho and based on your chart if i hung it at about 8 inches above tank, i would get a par of about 80.
I dont want to be limited on what plants i can grow and would like to get a nice carpet going. would that be considered overkill? I will be running pressurized co2 and dosing ei.
The Marineland light would give you very good low light, so that CO2 would not be needed. The others are designed for reef tanks so they would very likely be too much light for a planted tank, and would make the tank look weird with the actinic LEDs.
I've been trying to read through you older posts and it seems that in your opinion a T8 is enough for a 12" deep tank with low light plants. I guess my question to you is, are the marineland T8 fixtures ok, and would you recommend 1 or 2 of them for a 20 long 30"x12"x12". I would also love to get your opinon on bulb choices, I listed several of them in the thread. Thanks in advance if you find the time to help.