Guppy

[irb]

Have a 29 gallon tNk with 3 guppies 3 danios 4 mollies 3 fiddler crabs... I had problems w high ammonia i finally got it down to 0 but not nitrite:5.0 and nitrate:80... One of my guppies is laying on the gravel and the fiddler keeps on following him how to get him back to normal with these high no2 and no3 helppp!!!

 

[tarpon]

The guppy is dying because you have an uncycled tank. And fiddler crabs are supposed to be in brackish water for long term survival.
Anyways i think your best bet is to either kill the guppy or do a quick large water change. And make sure you keep doing daily water changes to keep the levels down. 80 nitrate is ridiculously high

 

[Mumma.of.two]

Please read this and follow it.
http://www.aquariumadvice.com/artic...g-but-I-already-have-fish-What-now/Page2.html
Daily water changes will be needed.
The fiddler crabs need brackish water AND a land area. They are not fully aquatic. I suggest returning them or getting them a suitable tank to themselves.

 

[irb]

Thanx mumma