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I read a time ago that some schooling fish dont school in species tank, because there's no predator fish... That turned out to be true, in the past I had danios in community tanks and they were always schooling near the top, now that I have a species tank they swim all over the place and only...

Can I overstock a Planted tank? I have a 20 gallon densely planted with hornwort. Its a species tank I only have zebra danios, is it okay to put over 20 in a 20 gallon?? (currently I have 18) I constantly check my parameters, I have 0 ammonia, 0 nitrites and 5 ppm nitrates (hornwort is growing...