sounds like u have a nice tank... good mixture of things....
i mean u can try not doing water changes as often.... might work out just fine.... it would be a good test to let the rest of us know how things go if u only do a 10% change every 4-6 weeks ..... it would be a lot easier on me too i might try it if u found the results to be good...
heres what i have:
100G with 140lbs+ LR , 3" LSbed, 2 fluval 404's, 2 penguin 550 power heads, skimmer, uv filter 470W PC
corals:
xenia, metallic green richordias 14of them, teal blue shrooms 7 of them, yellow finger leather, brown toadstool, blue cup coral, bubble coral, colt coral, many different polyps, green flower pot, and a candy coral
fish:
tomato clown, hippo tang, dwarf lion fish, 2 yt damsils, blue damsil, 3 striped damsil, madarin, 2 siscor tail dart fish, red head jaw fish
inverts/othewrs:
24" white ribbon eel, purple LTA, green LTA, brown LTA, 2 RBTA's, 2 feather dusters, 1 serpent star, 1 electric scallop, 1 urchin, about 20 different snails and 30 different hermits