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I got bored of the weekly water changes. A week comes around very quickly and changing 175 litres is a hassle, (not to mention wasteful). The tank looks so much better without an light above it. Also the fertiliser routine makes it more of a monoculture agribusiness than a ecosystem.

Fair enough. I like to put those links out there because I started out high tech with a tank of a similar size to yours. I got bored of certain aspects of the high tech setup and eventually just switched everything off and let the sun do the work and have never looked back. If I had just gone...

You could go for the more low tech approach. Here's some useful info. Non CO2: http://www.barrreport.com/showthread.ph ... O2-methods Non CO2 natural light only: http://www.tuncalik.com/2009/09/biotope-in-my-study/ http://www.tuncalik.com/2010/01/indoor- ... aquariums/

Hi Thanks for the replies, sorry forgot to mention that the same has happened with three different solutions all different brands. Will test the leak theory, but my gut feeling is it is some kind of chemistry issue. Thanks R

Whenever I refill my drop checker, within an hour the liquid goes from dark blue to clear. No matter what happens to the CO2 levels in the tank it stays clear. It didn't do this when I was using RO water. I have searched the forum and while a couple of people have experienced the same problem it...

If the fluid in your drop checker goes clear, does that mean very high CO2? I only changed the fluid a couple of days ago?