I've had my IM 38 for about 3 years now and have been struggling with nitrates for about 2 of those years. I posted on another thread that discusses Marine Pure ceramic spheres (which I use) and the general consensus is that they are trapping too much detritus with how I have them placed in my back chamber.
While I've always been disciplined with WCs, and that has kept my tank mostly healthy, I've been a bit busier lately and haven't had as much time. My nitrates have crept up to unacceptable/toxic levels (100+ppm last check). Mind you, I haven't done a WC in about 6 weeks, but even then, these nitrates are climbing way too fast and I think the pics below show why.
So, all that said, in addition to getting back to regular water changes I think some changes to my filtration chamber are in order. Here is what I currently have:
Diagram:
Left chamber which holds cheato and a reverse cycle LED along with carbon in a media bag that just floats on top of cheato. You can also see the chamber just to the right of the "fuge" that is stuffed to the brim with spheres and the detritus that is collecting every where:
Right Skimmer Chamber:
Chamber next to skimmer also loaded with spheres. And yes, more detritus.
On another note, but probably related, I also often get this white film (see image) in my back chamber and I have to imagine that's not good. My return pump is an upgraded tunze that pushes 798gph so I don't think flow is an issue, but then again, maybe the spheres are blocking some of that flow and not allowing a fast enough exchange?
If I was going to completely redo my filtration chamber (while maintaining my skimmer and GFO reactor), what would you guys recommend?
Thanks!