I have a 55 gal grow out tank and planning to merge with my 125 as soon as they get large enough and was wondering how soon do you think this is possible. In my 125 I have a 7 inch gold severum, a 7 inch starphire, a 7 inch frontosa and a 8 inch bumblebee catfish and in my 55 gal I have 2 red spotted gold severums about 3 inches and 1 green severum about 2 inches , a chocolate about 2.5 inches and 5 clown loaches all about 2.5 inches. I have plenty of filtration but was wondering about the aggression levels with the bigger fish, as they are all very non aggressive but when I introduce the smaller fish if this will cause havic?