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The Fluval heater in my 50-gallon tank broke right down the middle. Not sure when, I just woke up this morning to find it that way. Maybe one of the plecos hit it wrong.

I've removed all the parts...

I've read conflicting opinions as to whether too much gravel vacuuming can have a detrimental effect on the biological filter. That's what I was wondering about.

I've thought about trying the...

The troubled shark is doing a lot better now, thanks for all the help.

However, I was wondering if anyone knows how I can accelerate the cycling of my 50-gallon tank. It's been going for almost 3...

Nitrite is now around .25 ppm and Nitrate is around 40ppm. The fish still isn't looking that great, though. I've picked up some anti-parasite fish food.

There are 3 rainbow sharks in the tank. They're all going to the 50-gallon just as soon as it is cycled; I've been aware this tank is too small for some time They don't fight much, though, so I don't...

I use API Stress Coat as my water conditioner. Also, I usually add a bit of TopFin Bacteria Supplement 15 minutes after every water change.

I'm starting to suspect this fish may have fin rot. The...

It's six months old. It's long since cycled, so I'm not sure why the nitrite levels are so high. Like I said I'm working to get them down; I added an API Nitra-Zorb packet to my filter, and I'm doing...

I've added salt and raised the temperature. The fish looks better. However, I think he's still sick with something. His fins are very transparent and he's still flapping them around constantly. Any...

Thanks for the information, I'll look up that brand of test kit.

I don't have a liquid test kit, just the strips. Can you recommend a more accurate kit? Ammonia and Nitrite levels looked safe, but it's not always easy to tell with these things....

I did remove...

I have a rainbow shark in my 10-gallon tank which looks sick. (I am preparing a new 50-gallon tank, but it is still cycling.)

The fish has some white dots which are probably ick, and its lower fin...