First of all, large fish have a large body area, and you will definitely scratch them when you have a holiday in the first few days. Secondly, large fish eat more and excrete more. If bottom sand is not conducive to the removal of feces, it is not a good thing to accumulate for a long time. Also, don&;t put any fake water plants, which is not good for water. If they are corroded for a long time, they will kill the fish.
It is recommended to keep the harbor bottom clean and free of sundries, and it is recommended to stick a single color background, such as black or blue. Only in this way can the beauty of the dragon be set off.