Is there anything wrong with doing major water changes less often

[Naso180!]

Truly a tank that has held water for 50yr!? That's awesome!

 

[Paul B]

Actually I put everything in new glass when I moved here 4 years ago. The old glass tank was 40 years old and scratched. :)

 

[X-37B]

10% 12g's once a month now on my 120.
Same for my 45 frag system 6g''s.