okay so i have a juwel vision 260 tank running a rena xpstar 3 and the standered internal, lastnight i took out the standered filter thought it was taking up valuable space in the tank. atm the tank has a juvie flowerhorn,midas and texas, also i have my freinds tiny tsn untill it gets to about 4inches then hes having it back, the question is, do i need to have another filter running? thanks