ShirleyWolf I also own a African Lungfish. Basically what size tank do you have measure it and give dimensions than we can figure out how many gallons and what size is he ? Water conditioner is Aqua Plus and Stress coat are two good ones you can buy these at any local fish store. Usually around 12 bucks for a decent size jug. Than just follow the directions on the bottle. As for the goldfish/koi they generally like cooler water so mixing the lungfish and the goldfish.koi isn't the best situation due to illness from different water condition needs.
Salt and warm water and clean water can help in fin nips and infection. What size filter is on your tank what kind ? To provide th ebst qaulity of life you can for him a decent size tank and filter would be best. However due with what you have now. Maybe upgrade bit by bit like a newer better filter, also bubblers help to put oxygen into the water for the fish. As for water changes you should be doing 25% once a week or even every two weeks if there is not a lot of feeding or waste. Never drain your tank empty it could harm your fish (too much stress).
Finally your Lungfish has lived this long im sure he will be fine just maybe do some research and don't be afraid to ask questions, WE ALL HAD TO START SOMEWHERE
Salt and warm water and clean water can help in fin nips and infection. What size filter is on your tank what kind ? To provide th ebst qaulity of life you can for him a decent size tank and filter would be best. However due with what you have now. Maybe upgrade bit by bit like a newer better filter, also bubblers help to put oxygen into the water for the fish. As for water changes you should be doing 25% once a week or even every two weeks if there is not a lot of feeding or waste. Never drain your tank empty it could harm your fish (too much stress).
Finally your Lungfish has lived this long im sure he will be fine just maybe do some research and don't be afraid to ask questions, WE ALL HAD TO START SOMEWHERE
