how do i do this process without killing the benificial bacteria
Running them both at the same time for 4 to 6 weeks should do it. Or, take the substrat, or substrat pro, which ever yours came with, out if the 2217 and into the FX5.
You know the FX-5 has been replaced by the FX-6
yes but i bought fx5 for 120
Separate names with a comma.