Hi guys for some unknown reason my tank has gone slightly cloudy and the fish are at the top. I did a 10% water change yesterday and cleaned my filters. The only media I changed in my filters is the fine sponge in the external filter. I also added some bog wood that I had soaked in the dirty water that I took out for a couple of hours. The tank is 125litre the filters are an aquis 500 external and a fluval u2 internal. The water reads 0 Amonia 0 nitrites and 10 nitrate tap water is ten. I'm not sure if the tank is going through a mini cycle or if its because of the bog wood. Any advice would be great