I have just started BIAB brewing. Brewed a couple of batches and they have turned out good. But I have noticed these floating in the wort. It seems like these exist in the wort while boiling as much smaller particles and coagulate when the wort is cooling. Just so I can understand the chemistry, what is it? I am using a fine mesh bag and a fine mesh hop basket while brewing. I did use Irish Moss which could be the reason?