maine lobster, american lobster, homarus americanus, large fish

Does anyone out there have big grocery store lobster in their tank?

I would like to compare notes. 100 gal tank, 10 lbs live rock, 90 lbs home-made concrete rock. 120 lbs caribsea oolite sand, twin fluval 405's, turbofloater 1000 skimmer, 3 hydor 800 power heads. 3" domino damsel, 1.5" striped damsel, 2 turbo snails, 2" banded shrimp, hermit crab, 2 2" clowns. This tank has been running for little over a year. Last month I dropped in 6.7 lb male lobster probably 22" from claw to tail. water is 67 (it's winter). it's only been 3 weeks, after 2 weeks ph went from 8.2 to 7.7 I've been adding 4 tsp of kent marine ph superbuffer dkh every day for the past week. almost normal. I feed him fresh catfish (size of 2 or 3 mcnuggets) every couple days. recently I've been adding half ounce of ethanol (vodka) a day to help skimmer. I'm thinking about running a sump or a refugium, maybe 2nd skimmer or maybe bigger skimmer.

Does anyone one have large marine fish? what do you do for filtration. My friend has 15" oscar in a 55 gal. but thats freshwater.....so different system.