Does water movement in the DT have to do anything with syano getting some going to add some chemiclean today I know the system is justva month old and it still going through some cycles even though everything in it is from my 75 and is about two years old , can it be the skimmer I know is small for the system but it brings out a lot of skimm is an octopus 75h I clean the cup about twise a week and I have dry skimming advice