hi i was told by someone that orandas and fantails can not be mixed bc of their wens making it hard for them to eat. i was wanting a few more opinions on this. id also like to know if i have any more room in my 55. currently i have 1-ryukin goldfish and 2-fantails. my filteration will be a penn plax cascade 700 and 2 aquaclear 70s. i also plan on bamboos sticking out of the back for extra nitrate control. i would also like to know if golden dojo loaches can work with goldfish and if i could get any for this tank and how many? thanks!!