It sound's as though it is a new tank, and you are burning to much light at this point in time, the ecosystem/biomedia has not had time to build.
Turn the light's down, 12pm to 10pm with 2x64..the 2hour break does nothing, i would ditch that idea and keep it simple and straight.
Don't add all that Ca/Mg, kH3 is perfect, then you can put the pH where you want it.
Remember! the light's are the driving force, the tank is not ready for alot of it, you will need about 3 or 4 week's of this less light maybe more, depend;s on the tank.
Next water change use straight tap water, no Ca/Mg addition on you're part.
Let the ecosystem work at it's pace...Pay attention to the fish, algae, and most importantly, the plant's, they tell the truth.
for the next week or two dose
2x64 8hr's first week, then maybe you can bump it up to 10 hour's, once again, the plant's will talk to you, if you pay attention.
3/4Tsp KN03 Twice a week
1/4Tsp KH2P04 Twice a week
1/4Tsp [email protected]
change then another 1/4 midweek
15ml CSM twice/week
Dont add any Fe at this time, wait till the tank is in better shape, keep it simple.
Clean as much of the algae out of the tank that you can, keep picking at it.
Once thing's start to even out a bit, add little more light, add the other 2x64 a couple hour's before light's off, with an increase in light, increase fert's, C02 is going to be the tricky part.
Patience and persistance..