I usually wouldn't do a total cleaning of the tank all at once. But if she has already replaced all of the water, it should still be ok. But cleaning it too thoroughly (or scrubbing the filter and washing it in anything but old tank water) could damage the beneficial bacteria in the tank. This is the bacteria that converts deadly ammonia into slightly less dangerous nitrites and nitrites into nitrates. They're crucial for a healthy tank. Smaller water changes more often is usually the safest route and is less stressful for the fish. How much water and how often depend mostly on the size of the tank. Be sure she's using a good water conditioner as well. Seachem Prime is my personal favorite. Also, it is a bit pricey but absolutely worth it, you can purchase an API Master Test Kit (freshwater) at many pet stores. This will give a MUCH more accurate reading than any strips you find. I would recommend both melafix and pimafix working together. Seachem Stress Guard might help too. Something to look into anyway. Hope this helps! Keeping a tank clean is always important. But it's truly critical when treating a sick or injured fish.
Last edited by RavenHaired90; 04-29-2018 at 01:41 AM.