so, i have this issue tht my fish are getting stress when and after i do my weekly water change especially my midas fries and flying barbs. they would like hide after i do my water change and always avoiding me. this will continue throughout the week till i do my water change again. the midas in the other hand would come out and feed on my hand when feeding time. but the flying barbs will only eat when im not around. their tank is in the lower part of my double stand. the temperature doesnt change my much, probably only 2dgrees celcius after i do my water change. i dont what is scaring them. any possible ways to overcome this? need help.