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No, but I will say that I like Seachem Excel & Flourish. I use Greg Watson ferts for macros though. Much cheaper.
 

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Am currently trying seachem. Past couple of years I've had a planted discus set-up and started out using a full Dennerle system of hardware and ferts. Not used Dupla, but from what I've seen looks similar to dennerle, in that they don't give a full run down on composition, which makes it kind of difficult to keep control on what you dose. Also, historically us europeans have not been keen on adding phosphate and nitrate to our tanks, and I don't think these systems cater for those kind of off the shelf additives, whereas seachem does. With the dennerle system at any rate, it kind of requires trust in their 'system' rather than you having more control on what you add. Seachem seems to offer a more customisable dosing system, which you can taylor to meet your needs. You takes your choice...

Nick
 

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Ha! If all the conditions are right, they both do!! Personally, I think it depends on your philosophy towards keeping plants. Go to Dennerle's wed page and have a look at the Dennerle 'style' http://www.dennerle.de/. Nice tanks, but if you read the literature, the examples they show are quite long-standing set-ups, not set-up, and ripped down after a year or so (seem to remember one in their guide which has been going for some 8 yrs). The approach does not really 'overdrive' the tank with respect to nutrients and light in the same way that a lot of folks here are apparently doing. Lay-outs are often more wild looking with quite a diversity of plants, i.e. aquascaped in a quite different way.

Put simply, the Dennerle approach strictly speaking involves dosing Fe (E15) supplement and general fert (V30) alternately on the 15th and 30th days of a cycle, and performing a water change once every 2 weeks. Only quite recently has a daily dose of supplement (A1) been added to the range. Traces and vitamins (S7 & PG7) are also meant to be dosed once a week. Both Dupla and Dennerle use heating cables, and substrate systems are quite different to things like flourite and eco. My experience is that these kind of tanks are not quite on the knife-edge when it comes to nutrients, light etc compared to some of the tanks we see described here. I'm currently on a bit of a roller coaster with a new high light, high nutrient (for me anyway) tank which I set-up 10 days ago. The approach is different to my dennerle set-up and the end result will be somewhat different, and I think that is the point. One is not really better than the other, just different! Which, of course isn't much help to you..On a final note, my Dennerle system pretty much runs itself, although now I just use TMG a couple of times a week as a fert, so I guess on the whole maintaining the system isn't quite so involved. Just my experience.

Regards,
Nick
 
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