That's three full spectrum bulbs.
Correct it is a lot of light.
Not sure what you mean by the fourth one, "CoraLife" is a different brand than Giesemann.
My apologies, I am not near the tank right now but I believe it contains the word "flora" in the name. All bulbs have been made by Giesemann, however, I am forgetting the one product name.
It is -- understandable it should be reduced.
What is your photoperiod?
12 hours - 9 AM to 9 PM
How is your CO2 doing? Do you have a drop checker?
I do have a drop checker I run the co2 slightly low at a dark(er) green instead of the recommend light green.
Using a sump on a CO2 injected tank is kind of counter-productive. Way too much gas off going on.
It is the tank was originally designed to house Discus, which is still does, priority was giving to the Discus but I am achieving co2 saturation - I am just imaging at a much higher cost but so far we have only been talking $90/year
What ferts are you dosing?
KNO3
KH2PO4
TNC Trace (CSM+B)
How high is your Nitrate and Phosphate?
These levels typically measure zero in my tank, I am growing out the plants which will be explained within the next quote.
Are you sticking to the strict regimen that EI requires?
I am not, which maybe the issue, I have been doing 50% up until this week gradually increasing to the amount of time.
A: to watch the discus for issues - none expected but on a personal level it was my chosen method
B: All plants -- recently added to the tank and as such I did not feel the EI dosing recommendations where suitable due to the fact my plants had a 10 - 15% surface coverage. This has grown to 50% coverage and I am currently dosing 75% of the recommended amount.