I recently used frozen food (marine cuisine) to feed my fish, and tried not to put too much in, however it seems like a lot of cloudy liquid goes in that the fish would not be able to eat. A few days later after adding some more fish, my ammonia level shot up to 0.8. Not sure if this was due to the increased fish load, or the uneaten frozen food. Should a filter be used to screen the solids out of the frozen food?