Hello. I started my 75 gallon freshwater aquarium a year ago. My question is related to a particular type of fish. When I first started to add fish, I bought two bloodfin tetras, at least that's what PetCo told me. After doing some research a couple of months ago, I realized they are a schooling fish, and since I only had two, I purchased 6 more online. Well, the new ones don't look like the original two. I have posted two pics, one with all red fins (one of the originals) and one pic of the newly purchased. Anybody know the difference and why some have all red fins and others just a red tail? I'm thinking I have two different types of fish here. Also, the 6 new ones do not school with the original two.