OK, here is the deal....
I took this tank over from another service that left it in dismal shape. There is a limited amount of stuff I can buy for the tank. It is in a Nursing Home with budget constraints. It has NO cleanup crew. I plan on trying to coax them into it....this is a calssic case of someone doing saltwater without doing it correctly. When I took it over it had an undergavel filter that had no working airstones. Two cheapo hang on filters of which only one worked. I have no idea if it has ever been dosed in any way. You should have seen the thing before I took it over....(I care for several tanks salt and fresh) All of my other tanks are beautiful. I have simply never seen so much "gunk" aka detrius...I have done water changes until I am blue in the face. I have even manually removed the stuff with a net. It is simply amazing at the amount. I am trying to educate them...they want more fish....I keep telling them "not until we get this mess fixed"....water readings seem ok. They were over feeding big time...they have only two damsels left....truly tragic tank.....I am trying to save it. I just hope they will be willing to flop out the cash needed for the fixes.
Have any of you ever used...a product called...Marine clean or Liquid Gravel Vac....I wonder if this might help...even a little....I have nevr let any of my tanks get into this sort of mess.....any ideas are welcome.