Wow. I believe it. I had a a 46 gallon bowfront for years, that was easy to care for and then transferred everything into a 57 gallon with better dimensions. The substrate, filter, lights, etc... stayed the same but, all of a sudden had algae I hadn't seen in years. Now after 4 months, it's starting to stabilize. Maybe its a function of time more than methodology. I had used EI, then went to PPS Pro a month or two before the transfer. I am now using PPS Pro recipe but with double traces and higher kh2po4 as a result of deficiencies. Hey I was happy that I didn't lose any fish.Exactly.
But at some point, in older tanks, the aquarium becomes stable. This happens with or without EI. If you setup a planted tank and ignore it for a year, leaving algae to grow as they please, plants to grow or not grow, and only change water once in a blue moon or top-off after a year you will have a stable tank anyway.
And if you have followed EI you will tend to believe it works and it made your tank stable.
Thanks Niko for this post. It explains alot of things for me.