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If you have hard water and use CO2 to decrease pH for fish used to soft/acid water is this an improvement to their environment?

How do you suppose this water softener works? Hard Water Regions of the UK I have only heard of deionisation and reverse osmosis as water softening methods, and this appears to be neither...

Just wanted to chime in here. I have 20l with 3l of ADA Amazonia I in it. My tap has Ph 8 and Kh 13. Even with 10% daily water changes Aquasoil brings the Ph down to 6 (with pressurized CO2) and the and the Kh to 3.

Update Although for the first couple days there appeared to be no change (and perhaps even worse), after implementing the prescribed changes there is now almost no visible remains of the scum, and the water on the surface is moving freely again. Thanks ceg!

Reduced the photo-period, added some floating plants, and upped the ferts. We will see if this works. Interestingly, with regards to the thread suggested by ceg4048, the surface scum appears to have little red balls in it, perhaps made of iron like the thread says.

Much obliged!

So in the morning there is no surface scum / bio film / ? on the surface of my tank, so the outlet of the filter breaks the surface and sends water all the way across the surface of the tank. But then as the day wears on, a semi-transparent scum/film forms on the water surface and prevents the...