Hey guys.I visited my local lfs today wit the intention of buyin 4 yellow labs for my 29galon tank,the problem is that they keep all mixd malawis in 1 tank,saw a couple fish that lookd lyk yelow labs arnd an inch and a half long,the problem is that they had bläck stripes on their bottom fins..Are they yelow labs or not thats my question??Any help wil be apreciatd .Tnx guys