For such a group, a 27 liters tank (a cubic foot tank is 27 liters) might be a bit over the top, but not much. After all, the tank is not full, the tank will have some sand or something and lastly, the tank is measured from the outside, the inside being smaller. I would not keep 10 in such a tank, better called a glorified bucket
I think that, if you try and fill the gourami with these 6 neons (as a thought experiment, obviously), there is quite a bit of room left. That is, this gourami will need more water than the 6 neons do.
Further the fish will reach 10 cm. A fish, even a quiet one, would need a tenk length of at least 6 times its own length. that is 60 cm or 2 feet.
The names you gave don´t mean much to mee, but I think it is 1 Trichogaster leeri and 2 Trichogaster sumatranus. I think I would take a 3 * 1,5 * 1,5 feet tank, add the 3 gouramis and add a schooling fish.
Neons are from south America, personallyu I would go for a fish from Azia, more precisely Thailand or Sumatra where these gouramis come from.
You were very lucky!! but also that was a nice big tank.
When I got it, I was living in a studentsroom, of less then 5 * 3 meters. It was the fourth tank there, and the second large one. In my eyes, in any house a 1.5 meter (5 feet) tank will fit
Later I moved, I had to rehouse all 4 of them in 1 day. Luckily I had friends to help me
Also, check the temperature preferences of the fish to be sure they will be comfortable with each other.
Alternate: How about some of the more difficult Licorice or Chocolate Gouramis? A breeding pair would probably work in that tank. Maybe add some of the smallest dwarf Rasboras.
Happy fish keeping!
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