ammonia and nitrite problems

kitties1

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I have four tank set ups for freshwater fish. The first is a 10 gallon that I keep slightly brackish with three swordtails. My ph, ammonia, nitrite, nitrate, GH and KH are perfect. This tank is runnign smootly without a problem, haven;t lost any fish from it.
The second tank is also a 10 gallon with a male blue dwarf gourami, red flame, gourami, ruby shark, bronze cory, and panda cory. My Ph and nitrite are perfect, but my ammonia is at about 4.0 I did a partial water cange recently, and vaccuumed the gravel. After the water change the ammonia spiked. Any advice on why and what to do to fix it? I tried AmmoLock to correct it but the readings are out of wack (product warns of this). How do I knwo if the ammonia is at 0 again?
Okay third and fourth tanks were set up on the same electrical line. The power went out recently (about a week ago) on this line (stupid circuit breaker blew...long story) and now my nitrite and ammonia levels are berserk - nitrite is 6.0 and ammonia is 8.0. I haven't seen any adverse affects in my fish, yet...The one tank is a ten gallon with an african butterfly fish and 10 neon tetras (i know they can get eaten but so far there have not bbeen problems). The other tank (which is also having a Ph problem) is a 30 gallon with: i ruby shark, 2 peppered corys, 2 albino corys, 2 zebra loaches, 3 clown loaches, i common pleco, i male blue dwarf gourami, and 2 bala sharks.
i have tried water changes everyday but to no avail. i don't want to lose my fish and can't house them anywhere else. any advice? please help!

BTW I have to mentiont hat the african's tank and the larger 30 gallon have cloudy water, just started this way this morning. Is this a good sign? New bacteria? arrgghhh, am i going to lose my fish?
 
i am certainly glad others have regarded my need for urgency as high as i do. how come no one has posted a reply? i know you are out there reading this.....
 

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The two tanks with the problems. First of all they're badly badly badly overstocked.

Second sounds like during the power outage they lost their bacteria bed. The biological filter broke down. Try adding some media from the two tanks that aren't having a problme and do daily water changes to lower your ammonia and nitrite levels since they're so high right now they could easily kill the fish.

Also if you're not familiar with the nitrogen cycle read the pinned topic in the beginners forum entitled "Avoiding new tank syndrome"
 

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