tank is crashing!!!

[shotzee]

You can always order Salifert test kits from online stores and have it delivered to your house. Usually even free shipping once you spend over a certain amount, and if there are only a couple of stores locally that sell saltwater stuff, the online stores will probably have some other things not found locally.

I would have probably avoided doing a "massive" water change after you moved some rockwork around. If the salt wasn't mixed with the water for long enough, or if conditions of the new water weren't all that similar it could have thrown things a little out of wack.

[dufferdan]

I would also suggest removing your bicolor angel if you can catch it, and quarantine this fish. Are there any patching spots on the fish?

[dufferdan]

Moving the rockwork around could have caused this problem, yes. If your sand bed was badly disturbed you would have released lots of nasty stuff into the water.

[TheReefGeek]

That is my guess, which is why I reccomend water changes and carbon.

[Ruth]

What do you mean by ammonia and nitrates "almost" undetectable? If you are getting ammonia readings then your tank is going through a cycle and is probably caused by moving your rockwork and disturbing the sand bed. Water changes and running carbon will definately help in that case. OTOH if it is something with your salt mix or source water then you are only going to make things worse. Running carbon definately won't hurt and if possible try running it in a canister filter of some kind and change every day for a week or so. You really need to get some test kits and also post what actual reading you are getting for ammonia etc.

[hawaiiguy]

Thanks for all the advice everyone, I didn't think I'd get such a great response! So, I'll change about 30% of the water when I get home tonight and do a bunch of testing.
Dufferdan, I've been trying to catch my bicolour for a few days now... Sometimes I can flush her out of the rocks, but she still has enough energy for a fast break back in! And yes, she does have a patchy spot at the top of her head just in front of her dorsal fin. It's not a growth or anything, she's just lost her colour there. Its not her regular vibrant yellow, it's a dull whitish yellow colour.

[TheReefGeek]

Test the new water you mix up before adding it to your tank to make sure that is not the problem.

[hawaiiguy]

Right, I'll test the new water too... The salt mix I'm using is RedSea (I've been using RedSea since I started) and the water is RO/DI.