All my filters arent working what is going on.

[duanes]

Sure this is in the replies, but sounds like sand getting in the filters to me.

I would tend to agree with the above, it may be the intake tube is closer to the substrate than in another tank, and especially if you are using a fine grain sand, like play sand, or quickrete and the intake tubes are too close to the substrate, or with earth moving cichlids .
And when doing maintenance on these type filters, the entire filter needs to be taken apart and rinsed out, maybe even brushed where the impeller sits.
If even a single grain of sand gets into the impeller chamber, it can upset balance of spin and disable the filter.
On these type HOBs, I would clean the entire unit about once per week.

 

[Zanzag]

something like this also works to effectively raise the intake without modifying the filter itself 2 inch pvc works pretty well

 

[twentyleagues]

Are they all plugged in to the same power source? If it's a power strip maybe it's going bad and causing a momentary loss of power enough to stop the filters? Check that.