Coldwater fish for community 25 gal aquarium / fish tank, help please?

Question

I have a 25 gallon coldwater tank with 10 white cloud mountain minnows and 2 hillstream / butterfly loaches.(they are fed algae wafers so algae on tank is not an issue) The temps are for wcmm 19 to 24 and hillstreams 19 to 24 but the temp in my tank is a steady 21 to 23 always. It has wood in it for the loaches, a plant thats edible and a air pump. it also has overfiltration by a long way (a 35 to 40gal tank filter and a 10 gal tank small filter).

ok so finally heres the question-
I would like another loner fish to put in to vary it, however it must be ok at the temps and fine with the fish i have. please advise me another type of fish (just one or if its ok 2) that i could put in, preferabley not small like a wcmm.
thanks alot, nick

Answer 1

If you want something with a little color, consider some male guppies. Even though they're though of a tropicals, they are fine at cooler temperatures: http://www.fishprofiles.com/files/profiles/562.htm An all-male groups gives you the color, but without the reproduction.

Gold, green and rosy barbs are also capable of living at cooler temperatures, as are bloodfin tetras, and most danios (although all from this group would prefer to be in schools).

Some killifish will live in cool temperatures, but this is a big group to go through, and not all are suitable for community tanks.

Another possibility, depending on where you live and local laws, would be to try a few native species.

Answer 2

Ok yah that ok just mak the tank a bit more warmer:)
~ME~

Answer 3

A pike.