Colu

What I would do is change the layout then reintroduce your Betta that should help reduce territorial aggression

Do you have plants and wood to provide cover for the tetra and break up lines of sight so they can keep away from your betta

You could use wonder shell I haven't use that product before I no @laritheloudhas maybe she could chime in

It's possible the mystery snails you have added are absorbing most of the minerals in your water lowing your kH

That looks like a congo spotted puffer maybe someone with more experience with puffer can chip in like @mountaintoppufferkeeper

That on the low side for guppies lack of minerals can lead to shimmies bent spine's and other health problems in guppies I would add some crushed coral in a media bag to your filter that will raise your kH and pH I would add 1lb of crushed coral

What your kH at if it low your pH will drop due lack of kH

What are your water parameters

Welcome to the forum nice tank

Welcome to the forum is that an electric blue jack Dempsey

Welcome to the forum

It more than likely unfertilised egg that are getting fungus are the eggs a different colour that develope fungus also you can use ick x active ingredient malachite green to provent eggs getting fungus

Live plants will help and add an extra layer of filtration

Columnaris can external and internal bacterial infection with bacterial fin rot that usually external for most other bacterial infections I treat with medication in food it very effective at treating external bacterial infections and internal bacterial when added food theirs a couple of antibiotic treatment such as kanaplex and maracyn2 that are adsorbed thought the skin and gills so they are good antibiotics for when fish aren't eating most antibiotic need to be added to food to treat internal bacterial infections

She improved a lot with any luck she will be 100% soon

If your fish have an internal bacterial infection maracyn only effective at treating external infection unless add to food nitrofurazone can harm shrimp and snails jungal fungas clear fizz tabs have less of the active ingredient that furan2 had so hopefully your shrimp will be fine

If they have rapid breathing I would add an extra air stone i wouldn't use maracyn and jungal fungas clear fizz tabs together unless you added maracyn to food

That part of the fun 😄 the more the merry

I would stop the medication and salt all together for a week and then re-evaluate

A lot of people have success with 50% water changes with cooler water that what I use to do to breed my panda Cory's over years I must of have hundreds of fry off them before I rehomed them

From what i have read some species Otto's are seasonal spawns large water changes with cool water might work I have ever seem someone make a contraption to simulate rain with the ends of watering cans to Tigger spawning

Any signs of breeding active with your otocinclus cocama

It could be flukes with the symptoms your describing I would recommend treating with general cure as your in Canada I would treat with aquarium salt bath 1 table spoon for 1 gallon for no more than 15 minutes salt is effective against some types of parasites

Saw some wild poecilia wingei campoma males of this wild population have a variety of colour forms making me want to start collecting wild guppys i think I might be able to get a rack three tiers 2 15 gallons tanks on each shelf any recommendations for a suitable rack I like to go over kill with weight handling requirements

Some people use vita chem to add to there food the best thing for their immune system is good water quality no ammonia or nitirtes under 40ppm of nitrates good quality food I feed my tetras I mixture of foods hikari micro pellets and vibra bits bug bites frozen Cyclops and blood worms and brine shrimp and Daphnia a variety of food will provide your fish all the nutrition they and make sure they have places to hide and keep out of the way to reduce stress I find live plants are the best for providing cover not over bright lights have some floating plants to provide some cover general cure a very effective treatment for gill and skin flukes and tape worms aquarium salt good treatment for mild fin rot cut and injurys and some external bacterial infections and fungal infections it has antibacterial and antifungal properties and to reduce fluid buildup when fish are suffering for Dropsy Fritz compete a good water conditioner as it detoxify ammonia and nitirte I would also recommend have a broad spectrum antibiotic treatment like seachems kanaplex on hand as well as seachems focus and garlic guard to make medicated food