Tank crashing...could it be due to these?

[Son Of Skyline]

Let me know how the huge change goes. Meanwhile I'm gonna do about the same amount over the course of a week or two.

I used Kent Phosphate Sponge. I was told it changes colour when it's absorbing phosphate, but mine stayed clean as new over two days. Oh well, it was worth a shot. I still have some so I might as well use it up just for kicks.

Originally Posted by reef_raf

I did weekly 20g changes for about 6 weeks and I found that made it worse. Although stopping these frequent changes didn't make it better. I am going to do a 100g change tonight or tomorrow, just for fun. Overall, my tank seems to be looking better for the last 2 weeks.

What type of PO4 sponge did you use? I am using Phosban, which lasts a lot longer than the Al based products.