-Using R.O.\D.I. water exclusivley adjusted to 4GH with Seachem Equilibrium and 4KH with SeaChem Alkalinity buffer
The tank has been setup for 10 days and has had contained plants for 7 days. I'm currently using the following fertilization products:
Flourish 1.5ml daily
Flourish Potassium 2ml daily
Flourish Trace 5ml daily
Flourish Nitrogen 1ml daily
Flourish Phosphorus 1ml daily
When I intially setup the tank my KH was 4 and my GH was 4. I justed tested it again yesterday and my GH was 13 and my KH was 10?
I can tell you for a fact that Eco-Complete dont buffer water, its been personally tested.
It might be just a small oversight in your tests because I see that you are adjusting
your R/O water to the levels you want and "when" you test it is important, I have found that after adjusting anything the true readings wont come out for hours minimum so maybe the readings you took initially to come up with your "ideal" parameters were not 100% yet so they were still climbing.
The tank is only 10 days old so you are going to see many changes and fluctuations which will be normal, it shouldnt be that much in the GH/KH but all else will. I still think it was a testing error somehow because it does not seem that you have anything buffering the water.
It takes time to get it stable.
I would also get some scrub pads ready for the algae that you may soon see starting. You are fertilizing that tank IMO what I think is way too soon , even at those small amounts.
Newly added plants will normally go through a stage where they simply "acclimate" and feed off stored energy. I have had more success with new tanks when I wait as long as the plants will allow me before I start fertilizing.
Give the tank a few weeks and and keep an eye on the water parameters every couple a days and you will start to see a pattern.
Same applies to your plants, they can tell you a lot about whats going on as well...
Keep us posted, I am curious as to the GH/KH swings...