What do these little guys prefer to eat? Mine is currently chowing down on some algae in my tank. I put an algae sinking wafer in that tank as well for some of my other fish in there but I haven't seen it eat that yet. Will they eat any vegetables like cucumber or spinach? I'm also thinking of trying some bloodworms. Suggestions anyone? 
Also, should I buy a few more? I only have one right now but after looking online, some say they prefer to be in a group of 3+.
I know they like colder, faster flowing water. My tank is currently 75*F and I may put it a little cooler.
Thanks
Also, should I buy a few more? I only have one right now but after looking online, some say they prefer to be in a group of 3+.
I know they like colder, faster flowing water. My tank is currently 75*F and I may put it a little cooler.

Thanks