I'm a newbie after years of not having an aquarium. When I had aquariums in the 1970's we knew nothing of tank cycling and the only plants fish stores sold were floating plants. I have a couple of small tanks with bettas. I'm now attempting to start a 10 gallon tank using plants to cycle. It's been running for two weeks. I have water sprite ,moss balls, frogbit and pothos ivy submerged. I realize the pothos submerged is supposed to be a no no but I always kept them that way for years. I've been using Seachems flourish to fertilize. Ive ordered easy green. Do I need to change the water before using the easy green?