I was using vodlka dosing at a rate of 10ml / 100 gal over 8hrs. You will get a small bloom of bacteria but if you work the dosing up slowly you can avoid a full scale bacterial overload. I had to stop because of the ultralith field trial. I felt it does work as long as you supplment with other additives. There has been talk about vodlka being feed all types of bacteria in the tank as bad. Not so....even in zeo and ultra systems their food supplement still feeds the other bacteria. I think to have a mono strain of bacteria is very hard to achieve in a reef tank and if you did and found some way of nuking the strain your tank would be toast. Anyways the cost of dosing works out to be as expensive as zeo or ultra additives. In fact the cheapest vodlka I could buy was 20.00 or so. When you add together the other supplements you will find the true cost of dosing. I would consider trying vingear dosing instead if price is a problem. Both zeo and ultra have a lot to offer in the way of a systematic regimen to keeping SPS's healthy
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