I wouldn't say 50% is necessary...there's definitely some leeway.
But suggesting that water changes can prevent a cycle is pure nonsense.
But suggesting that water changes can prevent a cycle is pure nonsense.
If by many members you actually mean the minority, then maybe.
50% weekly water changes, especially on a 50g tank (unless it's SEVERELY overstocked), is a huge waste of water and is not recommended by practically anyone.
In fact, the veterans typically tell people that doing that much of a water change can be detrimental to the fish by disturbing/removing too much of the beneficial bacteria in the water.
Even 25% a week on 50g is a bit overkill with the stock the OP has. 15% a week or 25% every two weeks would be more reasonable.
I wouldn't say 50% is necessary...there's definitely some leeway.
But suggesting that water changes can prevent a cycle is pure nonsense.
I definitely appreciate everyone's input. I tried to be as cautious as possible with the cycle given some of the circumstances I was forced to deal with. I understand it wasn't ideal and that it may have contributed to this issue. I have read a lot and learned even more through this site and asking questions since that initial start-up.
So far there have been no more issues with the tank. All fish remain healthy and the water is still testing the same. I'm actually glad to hear it was probably bad stock because that takes some of the grief off of me. It still sucks to lose fish but I'd rather blame the store than my own negligence. I'm doing my best to make sure everything stays in good shape and thank you again to everyone who is responding!