I am soon to take delivery of some dwarf shrimp (snowballs and caridina babaulti) and the seller recommended the following to me 'Your pH value is a bit high, is not a problem for these shrimps, but try to add some leaves of Ketapang or similar.' From a bit of googling I understand that they; release tannic acid which lowers PH, have anti-fungal\anti-bacterial properties, turn the water brown. I am not unduly fussed about my water composition, if I was I would start researching TDS, RO water, hardness etc. My PH fwiw is 7.2. I am just curious in hearing anyones experiences with Indian Almond leaves. I also quite like the clear water in my tank to stay clear (infrequent water change, low tech 160 litre) so wondered if I added just a small leaf in my filter could I get some benefit without the water colouration.