Hi I have a 180litre tank with 1 small royal pleco, 1 platty, 1 kuhli loach, 3 mollys, 2 pearl gourmai. Since adding the new fish the 3 mollys and the 2 gourmai the ammonia levels have settled down to 0 after doing 10% water changes daily. I was just wondering how often I should clean the gravel with the gravel pump, the gravel pump I have sucks out a lot of water pretty fast so by the time I've cleaned all the gravel it could take around 30-40% of the water which I have read isn't good to do. I was wondering how often I should clean the gravel and if I should clean half one day and the other half another day