Thanks for the advice! I'm beginning to wish that I hadn't agreed to take on this tank on an impulse. Or at least that the previous owner had done more research. =/ But I'm learning as I go and hopefully I can try to do the right things for these guys!
Sorry, it's a molly, not a guppy. That was a mis-type. I am surprised that mollies shouldn't be with bettas though. I checked a few sites, this compatibility chart in particular: http://www.liveaquaria.com/general/f...lity_chart.cfm
before adding my betta. Yesterday when I was panicking I asked my husband's best friend if they could re-home the molly for me. I'm not sure what kind of fish they have, but they're going to look into compatibility with what's in their tank and let me know.
So my next question is whether or not my 29 g can handle the addition of 3 more cories and 4-5 ghost glass catfish? Not all at once, but within the next month or so. It would bring the total #s to: 1 betta, 4 cories, 5-6 ghost glass. I don't want to overload the tank, but I would also like to give these guys optimal living conditions (i.e. their appropriate numbers for schooling). I can probably look into re-homing the ghost glass too, but I'm rather fond of them now!
Thanks for everyone's advice and patience, btw! I haven't had a tank in a LONG time and it seems there's a lot to catch up on.