Thanks guys, you are making me feel better.
I'm going to be super careful with cleaning and take it slow getting more fish.
I dosed the minnows with various fish meds before letting them live with store-bought fish. They are quite peaceful guys, although I'm not entirely sure what species they are as I scooped them out of a ditch in Mississippi.
30 gallon looks good for now, they all seem lively and eating. I'll keep an eye on them and cross my fingers.
I have a 55 gallon as well with a cichlid, who is growing fast and I've never had any trouble with her or that tank...I think it's easier having a big tank with one fish rather than the smaller one with multiples.
I've decided it's more complicated to keep these guys than mammals...who knew!
Yeah but fish don't chew on your couch, stair railings, pillows or furniture like my puppy did. There's no dirty litter box to empty either like I have with my cat. I get just as attached to my fish as I am to my dog & cat.