Colu

Betta revive is a herbal treatment and not very effective what I would do is another course and of kanaplex or maracyn2 as most cases of fin rot are caused by gram negative bacterial I would do 25-50% daily water changes depending are the level of ammonia or nitrites not a 100% daily water changes that will stall your cycle and double dose prime to detoxify any ammonia or nitrites

You just need to treat their food not the water column

I would only treat the tank if other fish are showing symptoms

He's a food recipe for paracleanse

Thomas labs fish bendazole or you can use panacur c contains fenbendazole

I would add some crushed coral to raise your kH and feed your snails some hikari shrimp cuisine or shrimp king snail stixx both have add calcium to help with shell growth

Temperature on the low side for Bettas they do best at 80-82 to low of a temperature can affect the immune system I would add an extra air stone if he's still eating treat with kanaplex food and add some Indian almond leaves as they have antibacterial and antifungal properties usually when fish are very lethargic they are putting all of their effort into fighting an infection

You need to do three courses of treatment 2 weeks apart with paracleanse or general cure you left it to long in-between treatments that's why your still seeing symptoms

If their are eating ok and developing sunken belly it could be wasting disease as you treated with levamisole and your still losing fish I would treat with fish aids fenbendazole it's more powerful treatment it's best add to their food

It's possible their a parastic infection going pink colour could have happened after they died as you have treated with paracleanse and Expel p and two courses of kanaplex I would treat with fish aids fenbendazole it's a stronger parasitic treatment I wouldn't do a third course of kanaplex

Welcome to the forum MTs alive and well

What's your kH and when you say thinning do they get a sunken belly how long between fish dieing and another one developing symptoms

It looks like it's a genetic deformitie with a crooked tail it should be safe to add it's up to you can if you want to return him or not

No fish

1 table for 3 gallons shouldn't affect your Cory's or loach just monitor them after adding the salt if you notice any signs of de-stress do a water change to remove some of the salt

Stunning fish

With being in Canada treatment options are limited API melafix and primafix are basically mild antiseptic treatment they are not effective at treating anything more serious what I would do is add aquarium salt 1 table spoon for 3 gallons as it aids Gill function and add essential electrolytes and treats external bacterial and fungal infections and monitor if you notice any other symptoms then it can be narrowed down just remember to only put the amount of salt back in that you take out so if you do a 5 gallon water change put 1table spoon back in if you think it's internal parasites you could get medication from a vet

As your doing a fishless cycle holed off on water changes as you have ammonia source just monitor till your ammonia and nitirte go to zero and nitrates stay around 10-20ppm then do a water change before adding fish

I would wait you can add a little bit of fish food daily to help provide an ammonia for your benefial bacterial till it's cycled you could put him in a breeder box if your worried about his fins

White stringy poop can be poop with no food in it just the mucus lining and fish will occasionally flash if their doing it a lot then I would worry are you using a dechlorinator when doing water changes

As you have ammonia daily 50% water changes and add prime to detoxify any ammonia I would get a test kit for kH as low kH will affect livebearers due to lack of minerals in the water

Shimmies are usually bought on by lack of minerals I would test your water parameters just in case anything off and leave the tank empty for 4 weeks most pathogens and parasites won't survive for longer than 4 weeks with out an intermediate host

Have any of your fish developed a sunken belly White stringy poop flashing rapid breathing

Can you take a picture of the sick fish and what are your water parameters

I would add an extra air stone and a small amount of aquarium salt 1 table spoon for 5 gallons at that level it shouldn't harm your plants and it aids Gill function and add essential electrolytes till your ick x and maracyn arrive