yeah ive seen that 4000 before, i really dont like it. the 960 is absolutley beautiful though. great looking tank and fish. he had triggers and puffers mixed, but i guess in that size tank theyd be ok with all the room. also had a great looking eel and a nice coral trout (variola louti) and a panther grouper. usually dont mix 2 groupers, but then again in a 960 they should have enough room. imagine cleaning that thing. bo