Well I considered it because it is a tank that I have used in other emergency situations for the puffers, and it has helped in the past.
It wouldn't be permanant. It would just be something to get me through the next couple of hours.
Yes the HOB
is running at 5 cycles an hour, yet the puffers still look very stressed.
Oh, and I was instructed by a specialist the last time I had problems with my previous air pump to put the puffers in the smaller tank with the air stone. The smaller tank used to house my betta, but I gave it to my sister when I got a 7 gallon tank for my betta. I use the 7 gallon tank as a hospital tank when I need to take care of injured fish, and that is why the betta is there. I was told that this would be an excellant way to keep the tank cycled. I am however just going off what I have been recommended to do.