Drift wood is the easiest. You simply then soak in fressh water until there is no salt left over.

The discolouration, water softening and lower Ph brought on by wood and filtering through peat is necessary for breeding of some species such as Discus.

Water changes don't have to be weekly - I found fortnightly totally acceptable. The aim of water changes is to dilute the final stage of bolgical filtering creating nitrates in the water. Effectively, water changes can be whenever the nitrates are elevated which is easily measurable with a test kit.

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