Originally Posted by Byron
A 24g tank is not adequate for 3 discus unless they are very small fry. And in that case, partial water changes every day would be expected.
Fish continue to grow all their lives. If they are not in adequate tanks throughout, they can develop internal deformities. You may think they are happy, but you do not know that any more than I do.
You also mention goby in with these, I do not think that is appropriate. Goby prefer cooler temperatures than discus can manage.
I agree with Byron, I have raised Discus from size of fifty cent piece to adult size (approx 6 inches),, and unless the fish are quite small ,then 24 gallons with once weekly water change will in my view lead to stunted,possibly (probably),sick fish.
Most who keep juvenile Discus in small tanks do so because the smaller tanks make frequent water changes easier than larger tanks. The Juvenile Discus need several small feedings each day to achieve proper growth ,and these frequent feedings result in organics collecting that must be removed within an hour or two of these feedings in my view, if you wish for the fish to remain healthy. Is also why bare bottom tanks are often used, they make it easier to see collected waste. The water changes also bring necessary trace minerals that help with the fishes development and much of the growth of these fish happens in first eight months.
Discus should also in my view be kept in groups of at least five for as Byron has noted ,and many who raise these fish will also suggest,, they do poorly otherwise.(do best in groups)
A group of five ,Four inch Discus could get by in 55 gallons with twice weekly 50 percent water change and the three to four feedings per day in my view ,but if the fish are any larger,,then 75 gallons to ? would be something I would plan on.
I would also steer clear of most Discus found offered in fish stores, for there are plenty of folks who believe as previous posts in this thread indicate,,, that these particular fish will do well with minimal care and as such,, fish found in stores are often stunted,sick fish , with all manner of parasites and or bacterial pathogens.
I would as recommended earlier in this thread ,look for breeder of these fishes and inquire before purchasing,, what water parameters the fishes have been raised in (ie) pH gh,kh, and temp, and also what foods are the fishes accustomed to.
You will nearly always find healthier stock from a breeder than what is offered in most fish stores.
These fish are not particularly difficult fish to care for if their needs are met, but they are a fish with slightly different needs.
Read all you can find on their care,select the healthiest fishes you can find,and then raise a group of them while practicing what you have learned through your research not from any one source.
Only then can you get an honest feel for whether or not your efforts are rewarded.