Colu

Typical you want to add one pound of crushed coral per 10 gallons to increase your KH and GH you can add it to your filter in a media bag or add it to the substrate I would add 1 pound per 50 gallons just to get a slight increase in your KH to prevent pH swings little more information would be helpful how often do you water change what are you feeding and how often how long has the food been open any rapid breathing hanging out near the surface lethargy flashing spitting food out sunken belly white stringy poop how is the oscar hole in the head doing after treatment have introduced any new fish into the tank that could have bought in disease @Pompous_Oscar

Use a table spoon when dosing salt

That's not ich are the whites spots raised do they have a fuzzy appearance are they eating ok any rapid breathing hanging out near the surface lethargy flashing spitting food sunken belly @maspohno

Do a 50% water change I meant day 2 day 3 day 4 day 5 add one packet for 10 gallons with that level of ammonia I would be doing daily 50% water changes and add a double dose of prime to help detoxify any ammonia till it constantly stays at zero I wouldn't treat with maracyn2 till you get the ammonia under control otherwise the treatment won't be effective

I can see camallanus worms protruding from the anus I can't remember whether you mentioned this in a previous thread if not I would start treating with levamisole active ingredient in expel p once a week for four weeks that could be causing the swelling your seeing @Zeaqua

Yes I would quarantine you could add some aquarium salt 1 table spoon for 3 gallons while your away that will aid Gill function add essential electrolytes and help reduce any possible fluid buildup in the eye

Missed that what I would do is a course of kanaplex if your seeing no improvement after a couple of days or it gets worse

Cloudy eye can be caused by a number of things poor water quality injury or a bacterial infection of the what are your water parameters ammonia nitrite nitrate pH KH GH temperature do you have a pair of apisto is it possible the male has attacked the female @macdaddy36

I would do two 30% water changes a week till the wound start heal

Do a water change add two packets of maracyn2 per 10 gallons on day 1 on day 2 -5 add 1 packet of maracyn2 per 10 gallons day 6 water change with Indian almond just them to the tank they will start to leech beneficial tannins @ka47

That doesn't look like hole in the head I think that's an injury caused by the tri-mac cichlid I would increase water changes to lower the bacterial count add a small amount of aquarium salt 1 table spoon for 10 gallons that will aid Gill function and add essential electrolytes and monitor if you notice any change give us an update

Interpret antibacterial treatment isn't effective against Columnaris. Columnaris is a gram negative bacterial infections that spreads more quickly at temperatures over 75°f and can kill in 24hr to 7 days depending on the stain. the most effective treatment for columnaris is kanaplex and jungal fungus clear fizz tabs containing nitrofurazone combination of two medication provide a broad spectrum antibiotic treatment. as your the UK and it would take two long for that medication to arrive What I would do is start treating with aquarium salt 1 table spoon for 1 gallon at that level of salt will harm your plants and Esha 2000 I would treat in quarantine salt is effective against columnaris at a high dose it takes longer to work just remember to only put back in what you take out so if you do a 1 gallon water change put 1 table spoon of salt back in as salt only removed though water changes I would also get holed of Sera bactopur direct tablets active ingredient is nifurpirinol a broad spectrum antibiotic treatment you should be able to get it off eBay or Amazon @LemonGuy

I would add some crushed coral to the substrate or in the filter in a media bag that will gradually raise your KH

Two weeks without eating he become weak the prognosis doesn't look good methylene blue treats fungal infections some protozoan parasite such as ich what I would do is add Indian almond leaves as they have antibacterial and antifungal properties you might have to add one leaf per gallon to get a beneficial effect and do a course of maracyn2 as most case of fin rot are caused by gram negative bacterial infections even with treatment he might to weak to recover

Your water parameters are fine Camallanus worms can take four full courses of expel p one week apart to deal the spots could have a bacterial component what I would do is treat with aquarium salt 1 table spoon for 2 gallons for a week then give an update

That's not ich typically ich looks like small grains of salt sprinkled over the the body rarely on the eye and are flat the spots are to big to be ich are they flat or raised it's difficult to tell of your pictures and what are your water parameters ammonia nitrite nitrate pH KH GH temperature what symptoms are your seeing to suspect wasting disease

One more course is what I would do just to make sure there's not residual parasites left good here he's recovering

That the medication you want to use with kanaplex you could start treating with maracyn2 that treats gram negative bacteria that will treat columnaris combination of kanaplex and jungal fungus clear fizz tabs containing nitrofurazone provide a more broad spectrum antibiotic treatment I have never used kanaplex and maracyn2 as a combined treatment so i can't recommend it

That a good sign keep feeding him a small amount twice a day for the 7 days will go from there

What I would is keep offering him the food if he gets hungry he should eat it did you add garlic guard to the recipe that will help hide the test of the medication

Cory like to be kept in groups what are you feeding the Otto's and Cory

Looking at the pictures it's possible the start of columnaris that's a gram negative bacterial infections that spreads more quickly at higher temperatures and can in 24hr to 7 days depending on the stain the most effective treatment I have found is kanaplex and jungal fungus clear fizz tabs containing nitrofurazone following this treatment plan what I would suggest if this is the only fish displaying symptoms is to remove the fish to a quarantine tank and treat with medication i suggested it might not columnaris I always air the side of caution with suspected columnaris

What your ammonia nitrite nitrate pH KH GH temperature just in case something off tumors are really common in Betta's due to low genetic diversity looks like the start of rot what I would do is add is Indian almond leaves as they have antibacterial and antifungal properties you might have to add one leaf per gallon to get a beneficial effect and do a course of maracyn2 active ingredient minocycline also has anti-inflammatory properties maracyn2 shrimp and snails safe

chlorine is toxic at very low levels if your water has any chlorine I would recommend adding a water dechlorinator as your not seeing any symptoms I mentioned a parasitic infection less likely I would add frozen or live daphnia to there diet feeding a couple of times a week and repashy super gold that will help to prevent constipation that can be the cause of some of the symptoms your seeing I would add some live plants to there tank I have used water lettuce Anubis and fast growing plants such as wisteria and elodea with goldfish they will also help to reduce the algae as they complete for nutrients

Panda Cory's like cooler temperature 68-77°F it could be stress of the higher temperatures that caused them to become sick that looks like over production of the slime coat that can be caused by a bacterial infection poor water quality such as ammonia nitrite I would add an extra air stone complete the full course of maracyn2 if you have extra cycled media you can add from your other tank that will help lower your ammonia and nitrite