Ok I currently have the two groups of 3 dovii and 3 umbee in seperate 55g's now still waiting hoping to get a male. I have the 180 set-up currently with 5 5" Tinfoil Barbs and plan to add either the male wolf or male umbee with the Tinfoils once I can determine sex on either(wolf/umbee)...Now when this happens the cichlid i choose will be probably close to 5". How long will the Tinfoils survive and could i add a 6" youngster RTC....Also how long would this work before the Male Umbee or Wolf would have to go solo.........