I've seen the remora as touted as a good fit for our size tanks, but I'd rather spend the money on new lights ( I've got a 96 watt PC smartlight, which I suppose is comparably to what you have. I was looking into a 150W PFO HQI mini-pendant, which some people assured me would be more than ample to keep SPS for such a small tank). The bakpak may be the ticket for me.
I've tried Polyfilter and some Kent phosphate sponge for the phosphates. I can't entirely get rid of them. I suspect this is because when I filled the tank initially, I used unfiltered tap water, which made up most of the water by the time I put the live rock in. From reading here, I've learned that the live rock can absorb the phosphates, and then leach them back into the water over time. I use DI water now, and I've tested it and no phosphates go back into the system through make-up water or water changes (I do 5 gallons a week). I feed once a day, usually a half a cube of Prime reef for my three fish (orchid dottyback, flasher wrasse, and orange spotted goby). I've got 4 peppermints in there, and three serpent stars, and they do a pretty good job of getting the uneaten food. The peppermints sure are greedy suckers. I've been thinking about ordering some cerinth snails and a fighting conch (and whichever hermit they say eats cyano) from etropicals, but I don't want to get them unless I'm positive they'll eat the red slime.
I haven't dripped Kalk, because the only stony I have in there is a small tracyphyllia, and to be honest, I don't want the hassle. I tried using a Kent aquadoser for top off while i was away a few weeks ago, just with DI water, and it was a mess. The rate of evaporation isn't constant enough. I don't think I want to spring for a dosing pump yet, and I can't set up a NURCE like system unless i build an ugly shelf near my tank.
How often do you change out your carbon? Do you use it everyday? The Ecosystem people say once a week, but I think it really does help a little with the cyano. Does the water rush through the 'fuge too quickly after you took out the bioballs? I've just got a small powerfilter hooked up to the tank that I use to run carbon (or PolyFilter), and that I leave on all the time for surface agitation. If I do get the BakPak, that'd have to come off, so I'd probably have to run the carbon in the ecosystem like you do.