Help, I have lost six fish in 2 days!

My tank holds 55 gallons ( just looked it up) and the test I did was nitrite ( sorry, typo! ) I don't have an ammonia test kit, I was told to keep the temperature up to prevent whitespot happening again. Could it have anything to do with bloodworm, bad batch? Seems to have happened since I last fed it. Also, always a little nervous of doing to big a water change in case I change the temperature to much, is this wrong? I havnt done one this week yet, didnt want to stress the fish anymore.

Thanks for your help guys
 
what brand of test kit are you using?
 
The only way the temperature can harm the fish when doing wc's is if the temp change is DRASTIC. I have had the temp swing 10+ degrees F after changes because I was dumb and forgot to check the temp of my tap coming out. All the fish survived but they were not happy. I would be MUCH more worried about ammonia levels as that will kill fish if not permanently damage them if high enough. And nirite should be at 0 in a cycled tank. With nitrite I would not be surprised if you have ammonia. You should do wc's, enough to get the level down to 0.

Strip or liquid drip test?
How did you cycle?
 
The temperature is definetly too high. You need to test Ammonia, nitrite and nitrate. Ammonia is the biggest killer but all three need monitoring. You say this tank is three months old, did you add all these fish at once? How did you cycle the tank?
 
Its a liquid drip test, Im sure I cycled ok, added the cardinals first, after 2 weeks, then the rummynose. Did it all slowly, I havnt added any fish in the last six weeks and the nitrite levels have always been low, Why would an ammonia problem suddenly develop. Would this cause fish to bloat? Could it be something to do with overfeeding. I do have to put alot of bloodworm in to make sure the frogs eat, the fish always grab it. The fish are ALWAYS hungry!!
 
A hungry fish is a healthy fish (cheesy, I know, but true)

A fish cycle without monitoring the parameters can be a recipe for disaster. Adding all those fish so relatively quickly requires the bacteria colonies to do some "catch up" afterwards, which is what could be still going on. Its too hard to tell without an ammonia reading.
 
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