I have read a lot of people have it melt sags. Sorry
Can you try putting it in the flow so it is spread out over a bigger area. My Excel tank does well with BJ.
75g, pair of gold rams , 5 1" ABN, 1- 5"discus, 2oto's, 12ADF's,8 Assin snails plus babies, 96w 6700k-light 6hrs raised, No C02, Excel, EI dry macro's and micro's, Eheim 2126, 18w UV, 2 Nano 270 powerhead. wall of bubbles for more O2 for such a deep tank.