scubasteve
Aquarium Advice Activist
I'm noticiing when I've cleaned/replaced my filter media the past few times there has been a ton of white hard deposits all over the baskets and inside walls of the canister filter. They are hard and can be scraped off with a pad , are they calcium deposits? if so how do i prevent them, i have been using tap water to fill up the tank since ive had it which i know is bad because it has high nitrates and is causing tons of rust algae, but i just ordered a ro/di unit today so it should be here in a week.