Advantages
The most significant advantage of fishless cycling is that it can reduce fish loss due to ammonia and nitrite spikes. Fish loss can be very discouraging for beginners of fish keeping, so indirectly, fishless cycling can also help beginners get a good start.
Cycling aquariums using feeder fish is risky because it infects the aquarium with any disease or parasite they happen to have. Fish raised as feeders do not get the same degree of care as non feeders. Fishless cycling avoids this potential problem.
Fishless cycling also allows the aquarium to be partially stocked from the moment it is cycled, if the nitrogen cycle is completed with high concentration of pure ammonia added daily. This makes for faster stocking than having to wait several weeks between each new group of additions to the tank. It can also be extremely useful when the fish keeper plan to stock a tank full of territorial aggressive fish such as African cichlids, where the later added fish can be at a disadvantage.
Read more about this topic: Fishless Cycling
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