Using an old filter from a old tank will help speed up the nitrogen cycle...but it still takes time for the bacteria colony to build up in the substrate...it would be wise to wait for a few more weeks...(What kind of test kit are you using? Those combo types are not recommended..they are highly inaccurate.)
Keeping aro in a 2ft? That is unwise unless you plan to upgrade later...why not get a bigger tank from the start? Get at least a 4ft long and 2ft wide tank for the comfort of your aro.
Plant Physiology by Taiz and Zeiger
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