Hello, just home from work and notice a dead ballon molly and a half dead molly, the molly which as looked poorly after delivering some fry a week ago, the ballon molly had been fine was only put I the tank a few weeks ago, tested my water parameters and ammonia is reading 0.2, nitrite/nirate both read 0, I'm guessing a water change is required what % should I change I only done a 50% water change on Sunday as I do every week also this week I gave the media a very light clean couple squeezes in old tank water so I'm abit confused as to why I've suddenly had a spike all of a sudden so soon after a water change all the other fish are acting as normal.
Cheers
Cheers