Sounds like my whole family.
They all have freshwater tanks and have since befre I had my SW setup.
My dad is mad at his PC lights because he has algae on his plants. And he has to scrape the front glass every 2 weeks! He said I've had tanks since the 70's and I've never had to scrape my glass that often. I said "well, you never wanted to grow plants before" more ligth causes more algae, you need to do water changes"
He said he ahsnt done a water change in 2-3 months and he wonders why his plants have alage on them.
Mom told me yesterday when I was doing a water change on her tank (because I was bored) that the tops off alot of water every week so she didn't think she needed to do water changes.
Brothers Oscars both have hole in the head. So I looked it up and it said it's likley due to high nitrates from not doing water changes.
He hasn't done a WC in the 2 years since he's had the tank.
We did a water change yesterday. before the change I tests the trates and my test kit goes to 160 and it was redder than that.
So we did a 50% change and the test still came back as at least 160. Poor fish.
Every time I bring it up to any of them that they need to do WC's or they need to adjust this or test that they get rediculously angry at me and tell me they've been doing this longer than I have and never had any problems (except for cloudy water, dead fish, hole in the head, algae issues, ect ect ect.)
All I get is the same treatment, that I'm a know it all cuz I have this fancy SW tank now.
Sad.