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Tanner
David4968
Honestly and without offense, put whatever you want, there will be no joy anyway.
Tanner
The charm of nano aquariums lies in their simplicity; there's no need to complicate the system. All you need for a 20-liter aquarium is light, flow, and an auto top-off (ideally), and to maintain it with 2 liters of water changes per week using good salt. An external filter, especially a canister one, is completely contraindicated. A hang-on filter can be used, but it should be empty to hide the heater and oxygenate the water. A protein skimmer (live rocks) is also unnecessary if there is enough rock in the display. Besides collecting debris, it won't really help the nano aquarium in any significant way.
Monique1236
It is written on all forums that purigen takes away trace elements significantly... It's hard to check, none of this is tested...
Christopher1774
I do not recommend exceeding the dose. Once, I also exceeded the dose and my fish died.