You will be fine with just water changes. I shut my Hydor slim skim off for 2 weeks and none of my parameters went up. I leave it plugged in just because I already have it.
I'm looking to buy the eshoppes 75H in the next couple of weeks. Is there any mod needed to open and close the aquarium lid or is it plug and play....??
It's plug and play. The wedge pipe will interfere if you open the lid more than 30% or so, but it's totally manageable. I ran it for over a year on my JBJ 28.