No light on a quarantine?

Beastije

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So, I am in the process of remaking my 60x30x30cm tank for a new one. I am trying to order a stand, the tank, the works. I sold it to my partner as not having a new tank, but replacing another one (since I currently already have three tanks), I will reuse the light source, the filter, the sand, some plants, the works.
I will however be left with the older 54l tank as a backup, and my initial thought was to use it as a quarantine, especially since it is established at this point.

Since the best fish shop around here is like an hour drive or so, I was thinking to order the white cloud minnows for the new tank, but also order some hatchetfish and otocinclus for another tank at the same time, and quarantine them in the 54l. It is an established tank with loads of algae, sand will be removed but otherwise the biofilm can remain and the otocinclus should have stuff to eat. I have some spare airfilter I can use in advance to make it established too. But I dont have the light. The current light, which is a 60cm led platform, will go on the 75cm new tank, and at the point of fish ordering, the tank would have to be running for at least 3 weeks and that cant happen without light. I can keep the old tank adjacent to the new one, but still separated by like 15cm of space. Or I could move it on a windowsill, but the windowsill is 27cm or so wide and the tank is 30cm, which is risky.
Since the quarantine would only be for two weeks, could hornwort do some filtering job even without light? The space where the tank is is behind a wall and another bend so in a dark place, no natural light almost at all, but one tank light will be adjacent, one will be 2 meters ahead. I dont think I even have a useful standing lamp that I could use temporarily, I can check but last time I did that it was like 5cm sphere of lightsource since it had to sit with the shade on the coverglass:)
I dont want to add hatchetfish or otocinclus without quarantine, so if the option is not to have the quarantine, I would rather not get the fish.
 
Its fine if they dont have a light, in fact it may help the quarantine process because theyll be less stressed without light.
When you are about to move them into the main tank, turn the light intensity way down so the fish's eyes can adjust and slowly warm up to the fac that there is light
 
I don't think the lack of light will bother the fish at all, doubt the hornwort will do much growing without light though, and would likely start dropping needles/dying off by the end of the first week.

But since you want the plant to filter, and will be reusing the filter on your "new" set up, does that mean the tank be without filtration as well as light? I definitely don't think it can go without both.
 
I don't think the lack of light will bother the fish at all, doubt the hornwort will do much growing without light though, and would likely start dropping needles/dying off by the end of the first week.

But since you want the plant to filter, and will be reusing the filter on your "new" set up, does that mean the tank be without filtration as well as light? I definitely don't think it can go without both.
No no, before i remove the main filter i will add a sponge filter like three weeks prior for it to become mature and just leave the sponge there during the quarantine. If issues arise i could throw the sponge out later
 

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