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Am I right in thinking that I have to be a little more careful with CO2 in my tank given I am using rainwater? Presumably the low hardness means that co2 stopping and starting can cause larger ph changes? And the low hardness in rainwater makes the ph swing for the ideal CO2 concentration larger?

So on my new tank I will be using an in-line diffuser to remove one more item from the tank. I've read contradicting ideas of where to place this, some saying the outflow, into the filter, and others saying the inflow back to the tank. Obviously I want to ensure maximum co2 dissolving, so...

So the CO2Art regulator that I was having trouble with yesterday turns out to be an older single stage regulator, not a dual one - fell foul of the old issue of sellers confusing dual gauge with dual stage. Never mind, these things happen. So looking at my original regulator that I bought...

That'll teach me for feeling pleased with myself. Secured a CO2Art regulator from ebay. Dual stage, for much less than new price - felt good :) Arrived today, to find that it won't fit onto the extinguisher. On this regulator, the connecting shank /bolt screws directly into the BACK of the...

After some reading and thinking, I'm probably going to start off my 300l Discus tank with the following: Hemianthus Callitrichoides Staurogyne sp Taxiphyllum barbieri As far as I can tell, this should avoid the need for extra lighting (I currently have 2 x 54W T5 120cm flourescents) and also...