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Apologies, if this is a daft question. When testing your tap water for Hardness, Ph etc. do you test cold, hot, both or a mix at close to your tank temperature?

Thanks Charlie

Thanks Charlie, so are you advising for a 400 litre tank, 4000 l/h and if so how do others achieve this.

I'm planning on purchasing an Oase 400 highline but am unsure of what external filter to buy. First option is to purchase the Oase Biomaster thermo 850 (provides 1559 l/h). However, some sites have stated 2000 - 3000 l/h is required. or Option 2, to purchase the Fluval Fx6 filter (appreciates...