Hi,
Tell us a bit more about your tank first.
How big is it?
How long have you had it setup and running?
Whats in it? I.e. lots of plants? Synthetic stuff etc?
Do you have an idea about the pH levels of the tank?
Kissing gouramis can get quite big - they can grow to at least 9 inches, so if you have a pair, you will need a fair sized tank to give them room to swim. I'm not sure about compatability with a Siamese figher
If it was me, I would step back and have a think about what you really want your tank to be first, and then build around that. For example, in my tank thats building up at the moment, I really want to see a big shoal of tetra's flashing around in dark water - thats the image I started with for the tank, and then I've built up from there.
So, tell us about the tank itself - the questions I asked above. Also tell us what you want the tank to be like? Did you pick the gouramis beause they're you're favourite fish? Is it the Betta that you really like?
Steve