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Starting a new thread journeying into the microscopic world of our reef tanks. Not all images are mine. But will also include filter/coral/wool samples that cross my path. Hopefully this thread will be a useful reference to shed light on issues we see in our tanks such as algae or even fish parasite issues. And to encourage discussion about the right treatment once we identify what it is under the microscope. To the naked eye, diatoms look similar to dinoflagellates but are actually very different under the microscope. The treatment path is also different. Applying the wrong fix will only results in prolonging the issue or even create new issues.

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You said 'RO' does that mean you dont have DI resin?? I get 0 TDS all the time from a simple 5 micron sediment filter, two carbon blocks, a basic 75gpd RO membrane and some mixed bed DI resin. I tend to work backwards when I have an RODI issue (The sediment and carbon filter tend to help the RO membrane last longer. The membrane does all the heavy lifting, hence the reason to work backwards). So, firstly check your DI resin is fully packed well into the DI canister, as you could be reading some creep if not. If all packed in, does it need replacing?? If not and the resin is ok, next bet is your RO membrane. All membranes have a rejection rate. So if rejection rate of 99% then with Singapore water at around 60-70tdi you shouldn't be getting much above 1 or max 2tdi (as TDI machines are not super accurate), hence, assuming your resin is all good a TDS reading of 7 would indicate the need to replace your RO filter. Hope that helps. Sent from Singapore Reef Club mobile app

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Bump! Open to nego Sent from Singapore Reef Club mobile app