I have a recently purchesed (in the last month) 9011 skimmer running for a week so far on a 300 gallon aquarium. It is placed in the sump and I have double checked all fittings and correct assembly. All the water was new with live rock transfered from my previous tank. The foam will not climb into the collection cup neck. Is it still breaking in after a week or is there something I should be looking to double check? Thanks for any help that can be given.