i think those liquids which the LFS shopkeeper reccommend are not necessary. Perhaps the only worth buying is anti-cholorine.
i used to dose that last time, but after finishing the last bottle, i have not dosed it so far
and my fishese are still living happily.
good bacterial i doubt is important as your tank's filter system should do the job.
as for water regime, i change 20% of my tank's water weekly. roughly 1 big pail
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