Chlorine remover is VERY important when it comes to taking care of fish. Freshwater Fish can not survive in untreated tapwater unless it has had over 24 hours to set.Red spots-entirely depending on the variety of your fish - may be caused by high ammonia.Ammonia when in high levels will actually burn fish and cause them to have red spots called burns.The burns(if the fish is put into clean ammonia free water) will turn black and then heal over in a couple of days.I'm not sure what type of fish you have (for some fish it is normal for them to have red spots) but I'm guessing that your fish are suffering from ammonia burns and need to be put into clean ammonia (and chlorine) free water.If you don't want to shock your fish from the extreme change in pH they would undergo if you did that I'd recomend doing plenty of small water changes of 10-25% in the next few days.
I think the best thing you can do is let the tank sit for three days ,full of water with the pump going. If you don't want to wait you should at least add some Chlorine remover before adding the fish. You can find Chlorine remover at any pet store. Just takes a few drops. I usually do both; add the Chlorine remover then let the tank sit a few days.
Water conditioner is for removing chlorine from tap water to make it safe for fish to live in because chlorine will kill fish. Bottled spring water does not have chlorine so why on earth would you consider using a chlorine remover? If it ain't there, you can't fix it hey?
Yes, chlorine can kill fish. Fish can swallow it. Yes, chlorine can kill fish. Fish can swallow it. Yes, chlorine can kill fish. Fish can swallow it.
If your talking about Swimming pool its because your pool has chlorine in it and chlorine kills fish :(
Look at "why has my fish got white spots?"
Most fish can't, I don't think any fish can. One of the things you have to buy when you buy fish a petstore is tablets to nuetralize the chlorine or water that doesn't have chlorine in it.
catfish have whiskers and spots
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Nothing is wrong with your fish. Orange spots are normal, but if you're worried, take it to the vet.
If it has white spots (tubilcles) on it's gill covers (cheeks) and along the front of it's Pectotral fins then it means it's a male fish :-)
If the fish is a Goldfish you check to see if the spots are only on the fishes gills and pectoral fins. If so the white spots are indicating that the fish is in breeding condition. If the white spots are visible on other parts of the fish then your fish probably has Ich/Ick/ Whitespot and you will have to use a commercially available cure normally available at the pet shop.
Make sure to keep the fish in dechlorinated water. If your tap water contains chlorine or a similar chemical, add some chlorine remover to any water you plan on putting the fish in. Other than feeding the fish a small amount of food every day and periodically cleaning the container to remove waste debris, that is about it. Bettas are lungfish and are capable of drawing oxygen directly from the air. Because of this ability, bettas thrive in small non-aerated containers that would kill gill-breathing fish.