im 150 ext

Hello - I'm hoping I can fish for some ideas on what to do about my lighting conundrum. I am upgrading from a 50g IM Lagoon to a 180g standard 6'x2'x2' (opportunity purchase). The 180g tank I am picking up was set up with a 48" hybrid t5 with 3 xr15's (2 old g3's and 1 g4). On my 50g I have...