Have 28g nanocube with 1 stock pump and MJ 1200 for sump and 1 koralia 425 running. The sumps are on wave 6 min intervals. I shut off pumps to feed today and gramma came out of cave for a bit but when I turned pumps back on he went back into hiding. Does he just not like that much flow or is it he is only 4 days in tank and still adjusting.