Missing six line

[DEAD_BY_DAWN]

After a few days my six line was no longer able to be found after one week,i was considering buying another then almost two weeks passed till he came out to feed,there is no or very little bulling in my tank and if there is then its the six line thats doing it,i've no idea were he went and why he hid out for that long but he's fatter than before and still very healthy..