Fluval Betta Fish Tanks

Hello i have a fish tank 45l with 11 fishes in it (Shubunkin , opaline gourami , honey gourami , trichogaster etc) . i added the fish a week ago and tested the water and it was fine.today i see that 2 of my Scalars aren't eating like everyone else , so i tested the water . Everything was fine except for Nitrite levels that was 3.0 - 5.0 ppm. I changed 25 % of the water and added Easy Life Filter Medium and after some hours i tested again the water quality and it was the same I also added salt

I have a problem with parrot fish tank , when after water change I used 1000mg erythromycin for prevention to fungus and bacterial infection for parrot fish , so i today mistakenly not running filter and heater ,after that I seeing that in a large quantities white micro parasitic or bacteria type in tank in a free swimming stage swim all over tank though what I do that in this condition please help me ?

I have a wolf fish that seems to be sick. He is upside down in the tank now for 24 hrs. He is still breathing but seems to bee struggling. I have increased the temp in the tank and added aquarium salt. I have added a bacterial and fungal treatment today into the tank. I have used some moss to prop him up correctly in hopes this will help him. What would u suggest? Please help.

I have recently used medication in my 50 gal freshwater fish tank with one 22 year old comet goldfish in it . the meds cured my fish but must have killed my beneficial Bacteria as now my established tank has been going through another nitrogen cycle. It's been four weeks now the ammonia us back to zero so is nitrite zero BUT my nitrates are now spiked about 80 and the water is cloudy. Did 2 partial water changes over the last 8 days. Will a UV sterilizer help ?? Please advise. Thanks Lina

My year old has contracted either Ich or velvet. He is trying to scratch against his tank he has white patches but also when I've shined a light on him It also looks like he could have velvet. When I noticed his lethargy and his behavior I immediately transferred him into a smaller bowl to treat him with betafix (all I have until the pet shop opens covered his bowl to leave him in darkness His appetite is normal. He's bloated and is breathing but his gills I think are swollen. IDontWantHimToDie

my male betta has moderate fin rot & the people at the pet store told me to put him in a quarantine tank with aquarium salt for 7-10 days. he’s lethargic, not eating, and not moving much and im very worried. ive had him in a quarantine tank for 2 days now but pieces of his fins are still falling off. how long does the aquarium salt take to take effect? if the aquarium salt doesn’t work, what else could i try?

I have a black moor gold fish who has a severe case of Popeye I quarantined him in a separate , but I’m not sure what medication to use for him .

After using metronidazole 400mg×2 tablets in 75 litre aquarium tank, my two parrot fish has thread like some seeing near gills and genital area ? How to treat them ?

hartz flea and tick treatment used on Monday bath given on Wednesday. Can i use advantage muliti on her after the bath?

I adopted a young male cat from the shelter. He then got FHV so I took him to the vet and was given amoxicillin. He got better, then 2 weeks later got sick again. Our vet gave him a refill, but after 5 days of no improvement, I took him back and was told he now has calicivirus. He was given (attached picture), but it's been 3 days and his health is declining. Vet visits are adding up $$$ and I don't know what else to do! :(

When I used Malachite Green- F, after 24 Hours My Blood parrot fish and yellow parrot fish color has fading ,so I changed water after that this condition ,why do this changing color in fish after medication ?

How to get remove all planaria worms (crawling our aquarium glass in a tiny size )from freshwater tank ?