Cherries do well in a broad range of ph and temp. They are sensitive to ammonia, nitrite, and require a low nitrate as well. If you were to keep them in your tank, you would need to cover your intake with a sponge or prefilter. They are very easy to keep but max out in size at about an inch. If you have alot of moss, dense plants, the mamas and babies will hide out there. They eat just about anything, from flake to algae to bloodworms to wafers. I think that your gouramis would try to eat them, but if enough dense coverage was provided they could continue to reproduce. Introduction to the tank would be tricky to prevent them from being picked off at the onset. The females can have 20-30 babies at a time. Females are bright red, males red but more translucent. They reach sexual maturity rather quickly. In females, they develop a "saddle" area behind their head which are visible ovaries. After fertilized (about 2-3 weeks) the eggs in the ovaries are transferred to the swimmerettes where it takes another 2-3 weeks for them to hatch. There is info available at
www.planetinverts.com and many other sites.