Fluidised bed filter question

Hi i bought a po4 reactor to replace the need for putting po4 media in a sack.
I have just read an article on fluidised bed filters and am considering changing the po4 reactor into a fluidised bed filter.
(and going back to po4 media in a sack)

I currently have those plastic tubes in a sack in the filter system, but have been advised to remove them.

Ok so question,

Should i just take out the tubes all at once? or will removing them all at once cause a spike?
And likewise if i put new sand in the fluidised bed filter will it cause a mini cycle and cause ammonia and nitrite to go up??

Any Advice Welcome

 

Could you post a link to the article you reference?

 

I read it in a magazine, not online. sorry.

 

I guess im just asking if anyone used fluidised bed filters, and are they worth having??

 

I think they are more of a freshwater technology. Reactors are fluidized filters if you run you flow high enough to suspend the media. Suspending the PO4 media is good if you are using GFO.