forced suction filter with crayfish in it??

[Ej6hatchie]

Hello,

for the past month or so, ive been noticing this air powered filter in alot of aquariums overseas (asia). it looks like a plastic air driven filter with beads at the base and somehow traps debris and fish waste in a compartment while allowing ample water flow throughout the unit. The thing that intrigues me most about this filter is the addition of a crayfish into the compartment... my theory, is the crayfish breaks down waste/debris in the compartment ??

I tried looking it up and i found little to no info on this unit. its called CR 8800 forced suction filter

is this unit any good? i rarely ever see it being used over here (atleast from what i've seen on forums and FB groups), I see it being used more in overseas tanks

 

[deeda]

It appears to be a fancy air driven 'box' style filter.

I don't know why someone would add a crayfish to the sediment trap portion of the filter.

 

[CichlidFiend]

I was thinking crayfish aren't usually kept because they go after fish, so they put it in the filter so it can clear detritus and they dont have to worry about their fish going missing?

 

[J. H.]

It is an old box filter. Not in style, but as far as I know a good filter as any other. Kind of a hybrid between a sponge filter and a canister. I have never seen crayfish, but I know many people keep shrimp in their sumps to eat bits of food that get sucked in and speed up the nitrogen process. In some of the more elaborate aquaponic setups, the water goes from the fishtank to a tank with clams, prawns, or tubifex etc for the same reason. Better to have something eat the scraps and rot the waste than let the scraps rot in the tank. Also, I guess it would allow you to keep crays with fish that are not compatible with them.