Safety concerns. Always marinate meat and fish in the refrigerator. You can use some of the marinade for basting after removing the meat or fish from it only if you bring the marinade to a boil and cook for five minutes to kill any bacteria.
Running the pump at night should only be when you are doing a major chemical treatment such as algae clean-up. Your pool is more vulnerable during the day, plants don't grow at night the way they do during the day--that's true of ALL plants including Algae.
Turning the fish's filter off at night killls the bacteria and then denies them a chance to re-colonise, which makes the point of the filter void in the first place.It exposes the fish to ammonia and nitrite poisoning, and is completely irresponsible!! I very much doubt your friends fish are, in any way, fine. just now. Report Abuse. If you turn your filter off at night, then it stops being a filter and simply oxygenates the water. Filters work primarily through beneficial bacteria. When you set up a tank it is not really a suitable environment for fish because it is just a large bowl of water.