Are probiotics very effective being dosed directly into the water? I know some probiotic supplements such as PNS Probio are supposed to help clean the tank of detritus while others such as Nitribiotic are said to help with health of fish and inverts but from my research the bacteria have to reach the digestive system of the host alive and in relatively large numbers to be effective with the exception of breeding in some cases...are there actually proven benefits if dosed to the water? And do supplements like PNS Probio that are supposed to help lower nitrates and phosphates and clear the tank of detritus really work much better than carbon dosing to feed the already present heterotrophic bacteria?