BOUGHT A 4 YEAR OLD TANK WITH OVER A 100 RICORDIA MUSHROOMS THAT ARE TENNIS BALL TO SOFTBALL IN SIZE. HAD A LIONFISH, NIGER TRIGGER AND A GROUPER IN THERE WHEN WE GOT IT BUT THEY ARE GONE. ADDED 2 SMALL CLOWNS THIS PAST WEEKEND. NITRATES ARE A LITTLE HIGH BUT NOTHING NEW SINCE THE LARGER FISH WERE IN THERE. HAVE BEEN DOING WATER CHANGED 2 TIMES A WEEK TO LOWER THAM USING RO/DI. MUSHROOMS HAVE BEEN DOING GREAT FOR 2 MONTHS AND OVER THE PAST 2 DAYS SEVERAL HAVE NOT COME OUT LIKE NORMAL, IS THIS NORMAL??, LOOK SHRIVELED. NOTHING ELSE IN TANK EXCEPT 100 LR.