nurglespuss
Fish Gatherer
Although I'm not an advocate of big fish in small tanks, 5gal is the tank size given by most good books, provided the tank isn't boring and you keep an eye on water quality its fine to keep a single puffer in 5Gal.
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let's go back to the beginning here. Are you proposing to keep a dwarf puffer in a 20L?
If so I'm afraid the tank is far too small. They are highly inquisitive, active and waste producing fish. I would say nothing smaller than a 60L is suitable.
the only fish suitable for 5gal is a betta.
I have a puffer tank which is currently cycling and I'm more worried about the fact that the 20l isn't cycled. You cant put her in until it is as she will die. They are not a hardy fish. Return her and buy another when you are ready to add one to the 20l.
Please dont be rude when people are just trying to assist you. We aren't trying to upset you. Fish are a real Passion for some members on here and we just care for the fishes welfare.
That's what we've tried to give you. I have just told you that I have experience with Dwarf Puffers but you don't want to take it? I think the problem is that you want us to tell you that you're doing everything right not that we don't have experience. We aren't copying and pasting things off the internet. Many people on this forum are very knowledgeable in this area.
API is a brand of test kit.
A dwarf puffer is 2.5cm fully grown, 1 in a 20 litre would be fine.