"Micro bubbles" even in aged water?

[Ioan C.]

Hi, you should try to filter some of the dust thru a paper coffee filter, dry it and find out what it could be. I think it comes from the food. Pics are good, but not enough in this case. A magnifier or a microscope would be better.

[jimg]

I used to get that tan dust on the bottom too. it comes from the sponge filters. the more you clean the tank the more it seems to be there. I cured it with ac hob filters, although I see you do use them maybe more flow of larger hob? there will be no micro bubbles in water that is aged enough

[Ioan C.]

This begs the question why only one of several pools and why shortly after feeding?

[jimg]

would be good idea to look with scope or magnifying glass could be ostracods but I never seem them that extensive.....never know