HOW TO: add new fish to your aquarium


How to acclimate new fish to your aquarium.

Get the ultimate DIY book ►
Facebook ►
Instagram ►

Adding new fish to your aquarium starts with understanding what is going on in the bag and what you can do about it.

How to build aquariums:
How to build aquarium filters:
How to build aquarium stands:
How to build aquarium equipment:
How to build aquarium lighting:
How to build aquarium decorations:
Varius aquarium tutorials:
ALL Thursday videos:
ALL Sunday videos:


The king of DIY


What do you think?


Written by The king of DIY

Content AuthorYears Of Membership


  1. Thank you for this video it just may save some fishes today. I have 40 fish that have been in shipping from 600 kms away for 5 DAYS!!!!!
    It was supposed to be 1-2 days…thanks again Purolator :/
    The temp is 0 degrees out there and there is literally a foot of snow fallen in the last 12 hours.
    They have not arrived here yet but tracking says they are out for delivery.
    I will try the method of not letting any air in and dumping directly into the net after temperature acclimating…..That is if there is anything left alive.
    Fingers crossed.

  2. Not super sure, just a random idea but I’m moving soon and going to have to transport my fish and I happen to have a few marmio moss balls. Should I drop one or two into the bag? Would it help produce oxygen or “clean” the water a little more?

  3. Do you think there are any steps that can be taken to buff the beneficial bacteria prior to adding new fish to an existing tank with stock? I have been giving this quite a bit of thought for a while and other than adding prime (which is usually my last option), does anyone have any suggestions how to do this as safely as possible without overloading the beneficial bacteria and causing ammo / nitrite spike?

    I am planning on adding some larger fish to a tank in the future and was hoping to get some suggestions.

  4. I have a question. I just received an 8 inch tigrinus 24 hours in the bag. The guy who shipped me the fish didn’t tell me how to acclimate. It was the first time I got fish delivered. So I decided to drip acclimate. After about 45 min I threw the fish in the tank and headed to work. When I got home I saw one of the gills was red. Looked like ammonia poisoning. 3 days later the gills are a little pink but pretty much getting back to normal color. He still hasn’t ate anything yet. Should I be concerned or just give him more time?



My favourite aquarium project!

My HUGE goldfish aquarium UPDATE!