I see you've discovered, like we all do, that it's not always plain sailling and that there's a lot more to keeping tanks than just filling them with fish and water!
Please check out the beginner section where I'm sure you'll find lots of helpful information.
i have a nice group of mollies equalling lots of babies. several mixed gouramis some plecs and some zebra loaches. i did have a lobster but it got too big