Help! NITRITES!

Question
QUESTION: Let me explain my setup.  On July 5th and 8th I started up two 55 Gallon and one 10 gallon tank.

Tank 1 - The Kitchen Tank  -  was an established tank (55 Gallon)  where I lost my 6 year old Picostomis (bad spelling) and Angelfish.  I panicked  and cleaned EVERYTHING from the gravel up, so that is why I say I just set it up on July 5th.  I am now running two power filters and a BioWheel on this tank with two air stones and a Rena heater.  The tank has 2 each of Barbs, Giant Dobros, Little Sharks, and Glass fish and one Picostomus.  This tank is doing fine.  It is not my problem.  PLEASE read on.

The 10 Gallon was purchased as a hospital tank for my 6 year old Angelfish that had a swim bladder problem before she died on July 4th.  So the 10 has been running since early June?  I did use it as an isolation tank for the new fish as we bought them, but it has been sitting completely fishless since mid July.  It has the small filter that came with it in the box and one small air stone, and a set temperature (75 degree) heater.  The tank looks fine.  As mentioned it is an isolation tank so there is no gravel or decorations in it. THIS TANK IS STILL TESTING POSITIVE FOR NITRITES.  My other 6 year old Angelfish is still not eating and I was going to try putting her here by herself but I don't know what to do...and this is not my biggest problem!  PLEASE read on.

Tank 2 - The Living Room Tank  -  was a new used tank (55 Gallon) tank that I set up on July 8th.  I have followed the instructions that have been sent from the TetraCare emails to the T.  I have also tried the advise of other 'experts' and this tank is STILL testing positive for NITRITES!!  I have a H,O.T. Canister with carbon media. I also have a power filter and a Bio Wheel on the tank.  I have done a 25% water change every week (sometimes twice a week).  I have kept the fish alive by using Prime.  I have added Amaquil (live bacteria), Algone, Cycle, and Tetra products as indicated on the bottles and recommended by 'experts'.  STILL testing positive for Nitrites!  I have cut the feeding down to a tiny bit twice daily (they act like they are starving). The decorations are now developing a brownish/yellow algee? on them.  This is my Angelfish tank; it contains my surviving 6 year old Angelfish, 2 Gold juveniles, 2 black juveniles, and 2 marble babies (all Angelfish).  PLEASE HELP.  I don't know what to do!  I have followed the advise of EVERYONE and still the tank tests positive for Nitrites!  The yellow/brown coating just started this week.  All other water parameters test OK (pH is a little high).  I keep their water 80 degrees.

Sorry this is long, but I wanted to make sure you had all of the information.  I don't understand why Tank 1 has cycled and Tank 2 has not!  I took the gravel from Tank 1 and put it in Tank 2 in hopes of helping the tank to cycle faster when setting it up.  I have since added some additional black gravel to tank 2. PLEASE HELP!

ANSWER: Hi Jjanet:  What are the readings for the water chemistry???? do you have ammonia and nitrate in the tank or is it just nitrite?  What is the pH???  dave

---------- FOLLOW-UP ----------

QUESTION: Hi Dave,
I wanted to make sure I gave you current readings, so I just tested the water now.  The pH has dropped to about 6.8 the ammonia is still 0 and the nitrates are now climbing too (hadn't checked Nitrate in a while) it is at 10!  

I don't know what to do!

Answer
I would do a 30 percent water change ... it sounds like you had an ammonia issue in the last week or so that has corrected itself... as the ammonia ages... it becomes nitrite and as the nitrite ages it becomes nitrate... so nitrate is not so detrimental to fish and it will be absorbed at the waters surface.  The water change will help speed up the process... dave