I recently received a Aqeuon MiniBow 2.5 as a gift. I have been keeping a single betta in there with a few plastic plants, a large artificial log and some gravel. It came time for me to clean the entire tank. The morning after I looked at my tank and it was filled with disgusting cloudy water. I did a 40-50% water change and it was less cloudy. Any ideas on where this could originate? Also, I have the stock filter in there (the newest model with the hook on filter). If this is the problem what would be a good alternative filter. Thanks for any help!