my tank was something like that.... i took out all the LRs.... FW soak the LRs for 2 weeks.....
now the whole thing seem to be starting all over again..... haiz......
trust me tangs wont work....
i had an AT, YTs (3), PT, Kole Tang, Chevron, Achilles, Powder Blue.... all did not help one bit....
in the end... all died!!!!