03-26-2014, 08:47 PM
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Yeah, that's pretty common. I had a sorority who wiped out my snail infestation in just a few hours lol How many snails are in the tank/what kind? They also contribute highly to the bio-load so that could also be an issue.
As for the levels getting to zero, that's great but as I said, we generally like to test for at least a week after the initial test at zero. Sometimes it can be false as yours might have been and you just caught it at a good moment is all. But now you know for the future!
So all you can really do now is just keep up with water changes daily if you can. Don't feed for at least a week so you can get the ammonia under control and then feed sparingly every other day or so. What kind of food do you have and what are the first three ingredients?
Even though it is recommended with Fish-Less cycling to immediately add your fish, it depends on which type you used. With food cycling I find that you don't grow as much bacteria, it is just enough to take care of the food waste but not enough to take care of a molly, a betta and whatever snails you have in there. With using pure ammonia you can increase the ammonia so that the bacteria can handle a larger bioload when the fish are introduced after the cycle is done.
Also, I do agree that Molly's get much too big for a tank that size, they can reach up to 5 inches but generally on average of 3 inches. Regardless of size, Molly's are livebearers and livebearers tend to be rather messy and poop a lot lol. Bettas on the other hand do not poop as much, once a day generally at most sometimes twice but it's not as much and not as often so they have less of a bioload. And then snails, even Nerite snails which poo the least amount of all the freshwater snails, still poo's a lot. Any fish/invert that eats algae will poop a lot, shrimp not as much though.