Hose clamp
 

I am currently using one to clamp down the hose that is on my return pump
but even though it states is stainless steel it has begun to rust
is there any rust proof clamps that I can purchase if so where ?

Is the clamp submerged?

Yes it is

Which part of the clamp is rusting, the band or the screw ? Or both ...
Is there a part# on the clamp, such as HS12 or 16 or 20 ? Or a size range in mm

I was going to suggest wrapping a piece of thin rubber material around it and then securing top and bottom with zipties but for submerged water might still get in there.

I previously used a laguna pond pump and needed to use a gear clamp which rusted too. Not sure what I would have done if it was submerged sorry. You can get larger plastic clamps off BRS I think but I didn't trust one against 3000 gph.

Is the band that is rusting, and i couldnt get the part number
plastic would be great but i dnt know where i would find it.
just worried the rust would leach into the water and commit murder on my corals/fish

It's odd that the band is rusting but not the screw. It's usually the other way around with mixed-metal gear clamps where the screw is steel and the band is stainless
It's possible the clamp you have is knock-off garbage
If you'd like to try a full stainless clamp, look for a Tridon with the part # starting with HAS ( HS has a steel screw, HAS is full stainless )
If you're having trouble finding one, try a boat repair shop. You can get AWAB, Trident and Tridon to name a few
AWAB are about the best
As for plastic, I can't think of any I'd trust for a return pump
As for rust in your tank, others have stated not to worry about it as it's just iron

I use plastic ones. They work fine but I don't think they have as good holding power

Most hoses fit so tight that a clamp isn't necessary, take the clamp off and see if it holds without it. Stand back in case it doesn't!! :razz:

Another trick I've used is to use a pair of zipties (around the hose and pump) then another two ties to pull pipe and pump together.