All "dirt" is not created equal. The detritus that comes out of a filter is largely decomposed organic matter not unlike humus. Once fully decomposed, it has some nutrient value but is no longer generating nitrates. So much/most of what we rinse out is relatively inert material that we incorrectly perceive as "bad". As to BB, sure, some BB will be lost in any media cleanings. But this is not typically a problem in most aquariums. Remember that BB lives on any hard surfaces and especially in the substrate. And if there are plants, especially fast growing floating plants, the BB in the filter becomes even less important.
Since this is a new, cycling, tank w/ammonia, there should be little/no detritus anyway, but I would leave the filter alone until the cycle is complete...then clean as needed.
Also, you mentioned 'cartridge'. Cartridge filters are marketing genius, but I wouldn't use one. I much prefer sponge material. Matter of fact, I use sponge material exclusively as I've found that it not only provides excellent mechanical filtration, but also provides an excellent platform for beneficial biology...as good or better than rings, balls, pumice stone, etc....
Thank you for the helpful information!
But well, the reason I asked about excess detritus is because I really did have a lot. I did a dsm for 6 weeks and when I transitioned my plants from emerged to submerged, there was a bit of melt, but none that I could manually remove as it was a carpet and the melted leaves were very intertwined with the healthy ones. So I had to leave it as it was and in addition to that, I had my filter cycling for 8 weeks now with only two rinses in the last couple weeks so it seems as if there's a lot of build up. And my cycle was not going as expected so I ended up having to rely on a bacterial supplement (TSS+) and I was not supposed to change my water for 2 weeks. But after just one week, detritus worms started popping up everywhere (they now regularly are spewed out from my filter) and I started growing lots of algae, and I'm sure the excess nitrates weren't helping
But my cycle did indeed complete last week and I had been testing for an additional week just to make sure my BB were stable, and everything seemed great for 7 days but when I decided to do a water change and clean out my filter media, I saw a dip in the cycle.
Like you said, as I am getting more knowledge regarding filter media I am not too happy about how my cartridge has been working out for me. But I believe a large part of my BB lives on the cartridge and I would most likely lose my cycle if I were to throw it away. But I did add a bag of biorings in addition to the cartridge because I felt that the cartridge wasn't doing enough on its own. Fortunately, I think the biorings helped me finish my unending cycle but for now, I'm a bit hesitant to touch anything else because it seems like everything is so fragile. At least it has been so far in my experience.
It sounds like you have a mix of media in your filter? Ideally you want the water to go through a sponge and then the bio rings. That way the sponge traps all the goo. You give the sponge a really good squeeze/rinse in old tank water and you'll get loads of goo out. Just keep squeezing until it's clean, no need to be gentle.
If your biorings are mixed with goo, just give them a rinse in tank water. You can also replace a few at a time if you think they need it.
It quite normal for a bit of goo to shoot out into the tank when you turn the filter back on - don't worry it will make it back into the filter or your can syphon it out with your water change if you do that afterwards.
Yes, I have a HOB filter that came with a standard filter cartridge and I didn't know any better so I began the cycling process with the cartridge. However, my cycle was a difficult process and I did many things to try and help it along, including adding a bag of biorings next to the cartridge. And now that you mention it, you're completely right. Right now, I have the biorings first and the cartridge after, but I'll need to swap the order so that the cartridge can pick up all the debris first. But thank you for assuring me that the goo shooting back into the water is normal!