I have about 8 or 9 in of water in a tank that is 25 in tall and this makes siphoning water into my canister filter impossible. I have been using a Penn Plax Cascade 1000 for about two months now and when it comes time to clean it out and siphoning the water back in, it is really troublesome. For now I have to put the whole intake system in the water in order for me to pump water into the filter and even then I have to turn the filter on its side in order for this to work. When I finally get the filter to run properly I am only able to keep it on one side and moving it anywhere else makes the filter stop working. I would like to keep the water level around this height and also be able to move the filter under the tank. I understand that these types of filters aren't meant to suck out water from a tank that tall unless it was completely filled up and I am worried if the lack of siphoning is damaging the filter some how.
So now I have considered getting a submersible pump to help get water into my filter and also help get rid of my intake system that is under water. My filter pumps 265 GPH and I am wondering if getting a pump with something higher than 265 could be bad for it. I've been looking at getting a EcoPlus 396(396 GPH) because of the many ways I could use it for my set up and it comes with many connections including one in 5/8. They do have other models that pump at 290 GPH and 158 GPH, these would be the closer to what my filter has. I am sorry if I rambled on or confused any one but I just wanted to paint a picture of what I am currently dealing with.