Oops. Unintentionally lied... its a u3. Further research proved my memory wrong. Sry. What then do u suggest? Can't get rid of anyone and can't get a bigger tank. My options are limited.
I don't mean to sound harsh, but the mix of inhabitants (who will grow to impressive sizes) with the current filtration system will not work 9 times out of 10. Perhaps you are the lucky 10th.