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It very well could be a bristleworm

I have a 4 month old tank with a few live and base rocks. I've noticed as soon as turn on lights I see these reddish brown catappillar like worms. What are they and is this a bad thing?

Well to start, I have a 55 gal tank. The reason for the I feel major water change was that I had a crab to die so I had the water tested at the pet store. There they said my nitrite was haigh and to do a 30% water change I've had the tank for about 4 months. After the water change that's when...

I have a major problem! I just did a 30% water change and now my fish have died. I did the water change because the nitrite was high. I had the water retested and it was perfect but the fish died. The crabs and aneome are still alive. I don't know what's killing them. What to do?