I have tried several food tablets. Time they broke up too fast, making the water turbid. Others have been ignored by the fish (which just to know what tastes good and what does not!). Some of my catfish are so to speak only to 21 clock, so they will then become active. If I feed about 18 clock these tablets, then pounce next few catfish also gouramis it. And by 21 clock is for the late risers enough recognizable as tablet food.