Lactobacillus acidophilus maybe the reason for an acidic (pH ~ 4.3) tank that cannot be diluted,
Lactobacillus acidophilus 857-76 871-64 (st 1351-757 2162-813 2181-25 2197-813) Hz
Lactobacillus acidophilus st 3460-5 3470 3480 3490 3500 3516-5 3530 3540 3550 Hz
and
Lactobacillus acidophilus (tooth) st 3516-5 Hz
This bacteria could also be responsible for watery gums; the need for insistent gum sucking.