Well for a little over 4 years I have had a 125 gallon tank and a 75 gallon tank running. I have swapped around the tanks numerous times and finally settled on discus in a planted tank. Have had discus in my 75 gallon for a little over a year and a half with out any serious issues. It's time to bust out the wall and set up my 275 cube and rearrange everything. All the fish in the 125 to the 275 and the 75 to the 125. So much work but that's part of the fish keeping right.