Quick filter question

Hello, just did my monthly filter clean. Boy, are goldfish dirty
buggers. The sponges were disgusting. Anyway, rinsed them in some
tank water and removed some charcoal that was in there. (ashamed to
say for about 6 weeks). Anyway, I put it all back together. Topped it
up with some tank water so I don't have to use the primer (Fluval 404).
When it started back up it released a long cloud of misty water. The
last time it released lots of 'crap'. This time just an off white
coloured water. The tank is now really cloudy. Fish don't seem too
bothered except the excitement of some debris floating around.

Is this ok? Should i put off going to bed until i know everything is
ok?

Not had this one happen before.

Cheers in advance
Mellie