New sharks for my tank

he has a 20k gallon tank im sure he has the filtration to boot :p
Not necessarily, if you have just a couple catsharks in a 20k tank you wouldn't need any filtration. The natural bacteria and sheer size would dilute DOCs enough to keep water quality high. Trying to filter 20k gallons is no easy task and it would be necessary for a shark like that.
 
Our shark lagoon is 12 x20 by 4. we dont have many issues with our filtration We did have issues with humidity , final solution was to use postive air pressure ERV and commercial dehumidier for the whole building.
 
Surprise Reaction GIF by ANTIQUES ROADSHOW | PBS
 

WHAT KIND OF SUBSTRATE ARE YOU RUNNING ON YOUR TANK?

  • Bare bottom

    Votes: 6 20.7%
  • A shallow bed of fine sand

    Votes: 8 27.6%
  • A shallow bed of coarser sand

    Votes: 6 20.7%
  • A deep sand bed

    Votes: 3 10.3%
  • Mixed substrate or varying sand depth

    Votes: 6 20.7%
  • Some other substrate (posted in the comments)

    Votes: 0 0.0%
  • I don’t have a reef tank yet

    Votes: 0 0.0%
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