hey guys i have a 250L and a lil 50L fresh water aquariums i have had them up for about 3months i have 50 1inch fish and a redtail shark and bristlenose pleco in my big tank and as they have babies i put the fry in lil tank i keep my water between 24c-28c and do water changes and gravel vacuum like every 2-3 weeks but have no clue on how to do test water for anything?
