So I bought what I thought was a Golden Zebra Loach from Petco. They only had one in stock at the time. I know Loaches like to be in groups. I tried waiting for the store to get more but they were taken a long time. I eventually order 2 more online which I got in today. Seeing them side by side I now think Petco sold me a Yoyo Loach. What do you think (1 in back is online, 1 in front is Petco)? If they are different do I need have 3 of each kind or is 3 total ok. I don't really want to add more to the tank but I also want them to be happy.