KurtG wrote:

I won't make that mistake again, but the pump had a sponge in it. It
only took me 5 months to find that (in all it's gelatinous glory) from
my system. I kept wondering why (WHY?) do I have all this diatom growth
and lately red slim growing. And, why are my fish starting to gasp?

Doh! No water flow from the sump. That's it.

--Kurt

Thanks Kurt....you've just reminded me that I need to remove the carbon
from my filter......red slime is abounding and I hadn't quite got the
handle on why as my test kits were giving zero readings.....duh....the
slime is consuming the nitrates....get rid of the nitrate factory which
has resulted from the carbon sponge acting as a biological filter and
therefor a nitrate producing factory and hopefully then the horrible
slime will follow in it's demise#

Gill