i just purchased a thailand thin bar datnoid about 6 in' and my question is he suppose to be sorda dark with black thin bars thats faded or will he eventually get more yellow with darker lines as hes gets use to his new enviroment. how long will this take?? or is there any way you can increase his color (more yellow) ? im really new to these beutiful fish so any info would really be helpful.. thank you. Tom