May 4, 2013 #1 R Robo-cop9000 Aquarium Advice Newbie Joined Apr 23, 2013 Messages 8 I have had 4 zebra danios for 3 weeks now. Is it safe to add new fish in?
May 4, 2013 #2 armymp327 Aquarium Advice FINatic Joined Feb 28, 2013 Messages 685 Location San Antonio, TX depends what your water parameters are, like ammonia, nitrite, and nitrate.