i have buy 3 nice sveni i put them in a 55g the size its 4 to 5 inch.they are a little aggresive but nothing dangerous,after 3 days they dont want to eat crude shrimps,so i give them some little guppy,they are shy and dont look verry well acclimated(they are out of the bag from colombia since 4 days)i have a little high ph of 7.6 and the temperature is at 78. i will try to take better shots