hey guys so currently i have a 40 gallon breeder with 4 jack dempseys, a pictus catfish and a pleco (all juvenile) but my bottom currently is tan colored gravel and im switching to black sand, how do you recommend i do this, move out fish then take out my bottom or? keep fish in? i am worried that doing it with the fish in will stress them out to much , i don't have a backup tank or hospital tank so i would have to put them in a 5 gallon bucket if that is what you suggest, thanks.
( below is a picture of current bottom for reference)
( below is a picture of current bottom for reference)