Hello fishy people! I’ll soon be ready to add some mid-level fish to my 55. What do you recommend? Currently, I have 6 longfin blue danios that hang out in the upper third (will add 4 more at some point), 5 danio erythromicron that stay close to the bottom (will add 5 at some point), and 5 small mystery snails. I’d consider a mid-level school of smallish fish, or larger centerpiece ones in smaller numbers. My pH is 7.6, and the lfs said my water is very hard but I’m not well-versed in hardness so I didn’t understand when he threw a dozen numbers at me, rather smugly. (My water hardness test kit is on the way.) Temp is 23 C/74 F.