Tank Cycled?(30 Gallon)

Discussion in 'Freshwater Beginners' started by Philippians 4:13, Jul 30, 2017.

  1. Philippians 4:13Well Known MemberMember

    My tank is a 30 gallon and has three zebra danios to assist me in my fish in cycle. Yesterday I did a water change of 25%. Today, it had 0 ammonia, 10-15 nitrates, 0 nitrites, 7.2 ph, and no chlorine. Does this mea it is cycled and I can slowly start adding new fish? How many should I add to this newly established tank at a time?

    Last edited: Jul 31, 2017
  2. BottomDwellerFishlore VIPMember

    How long have the ammonia and nitrite been at 0?
    I would leave it until a week after the ammonia and nitrite were first at 0 so you are sure the tank is cycled then you can slowly add new fish. I would add about 3 small fish every 2 weeks.
  3. Philippians 4:13Well Known MemberMember

    Nitrites have been at 0 for a week, but ammonia only for 2 days. Would it be okay if I waited until next weekend and got 6 more danios? I know that you said only 3; but I would like to get them in a whole school.
  4. jdhefModeratorModerator Member

    It would appear the tank has cycled. I'm assuming you had elevated ammonia which dropped to zero, followed by elevated nitrites that dropped to zero and no nitrates in your tap water.

    If would be better to add just 2 or 3 danios, then wait 10-14 day before adding the next 2 or 3. The addition of 6 danios all at once, may cause you to go into a mini-cycle, since you may not have enough bacteria to handle the ammonia all those fish would start producing. It's better to add fish slowly, allowing time between additions for the bacteria colony to grow.
  5. Philippians 4:13Well Known MemberMember

    Thanks @jdhef!

    Anyone else have any opinions?
    Last edited by a moderator: Jul 31, 2017

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