I just cleaned all the filters on all of my aquariums. In December I put a Fluval FX6 on my 125 gallon aquarium and haven't had to clean it until today. It wasn't all that dirty, I could have went a couple more months without cleaning it. Not to bad considering I have at least 40-50 Cichlids in that tank.
I had a 20-25' pond up north. Ended up with two ponds connected with a stream. Putt a shallow well pump in the middle and ran water 24/7. Some of the koi got over a foot long. Had a willow that was 1' tall when I planted it at edge of pond. It was over 50' after 10-12 years.