I recently aquired an young adult op and I am having issues with him not eating. He seems to be interested, he sucks the "nls" in his mouth and then a few seconds later spits it back out. At first I assumed that he was not aclimated and thought that he would start to eat in a day or so but it has now been 4 days he still does the same thing. he is in a 75 gallon tank with 9 other malawi's water perams are ok ammonia 0 nitrite 0 nitrate 20 ppm "I have 10 ppm coming out of the tap so 20 is as good as I can keep it". All of the tankmates are good as ever. Any advise would be greatly appreciated thanks for the read.