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Anthony Calfo has talked about stores that use RDSBs made out of 55gal tanks to denitrate 1000gal systems: with depths of up to 2 feet. I think the basic issue is that a certain depth will allow denitrification to occur. Too shallow, and the water diffused in the sand will still have too much...

I'll check them again in a little bit: I need a more precise kit. I've made a lot of changes to my system (such would increase nitrates, some would decrease them) so it's going to be hard to tell exactly what did what. We'll see...

If you mean the one stalk that's sort of shrunken up into a bulb at the base, with the heads withered, mine does that too. Random heads do it, and then seem to get better on their own. It almost looks like the fingery ends clogged up, and the tube then balloons out from pressure or something...

I have a 1/2 inch return pipe, and I want to reduce it to the smallest CPVC size so that I can make spray bars that don't lose as much pressure as doing with a split 1/2 pipe would. But I'm not sure if there is any good way to fit PVC to CPVC. Generally I can understand why this wouldn't be...

Originally Posted by reefraff On the balloon thing and this works basically like the reverse carlson. The ballon is zip tied to the rigid airline. that is what feeds the air into the balloon. You put the balloon into the PVC and that unit mounts under water. Ah, that's the part I was missing...

variation on 2a, yeah. I actually wonder how that would compare to the standard top overflow version in terms of the wave it generates. Of course, if you have a wavemaker already, then you have a wavemaker already. :) The real tough part on these is attaching them sturdily enough so that it...

It ran just sitting in my sump, but when I finally got the PVC screwed back on (I'm hating the guy who built this now, I have to rebuild it ASAP: a huge pain to service) now it won't fire up per normal. And I have no way to drive water into it from above since the entire pvc apparatus is sealed...

My mag drive wouldn't turn back on after feeding today, causing quite a panic. But it seems to run fine when I disconnect my return pvc, so I rehooked it all back (a huge pain...) and now it wont run again. I can feel it pulling a tiny amount of water in, but i think it isn't primed or...

I believe that flexible stuff, provided it's both strong enough and can take the temp, is better in terms of having less drag on the water flow. Hard PVC often requires hard bends and these tend to reduce the gph, whereas flex can curve around bends more gradually. Of course, in some cases...

That's the sort of heavy moving parts/timer system I'm hoping to avoid though (basically the whole carlson surge setup). I was thinking more along the lines of an upside down container mostly out of the water, with the air slowly being sucked out and thus pulling the water up into the...

Er, do not expose sponges to open air... it's often deadly to them.

Still trying to figure out how the balloon thing works... And does anyone know a cheap way to pump air OUT of something, in order to lift water above water level in a tube? I'm trying to work out a system for lifting and then quickly dropping water in this way, but it requires pumping air out...

It all depends on what the point of your fuge is, and how the species fit with that goal. I know people that have their fuges just as visible as the main tank and do keep fish in there. If the the purpose of the fuge is nutrient export, that can work just fine. If you want to keep pods in...

brand?

I wonder: are these new Koralia's going to be DC-based: is that why they're a step up? Anyhow, the new ones will be more expensive, and then the wave controller itself is the usual several hundred dollar extravaganza...

Played around with a prototype RCSD using just some pvc, a coke bottle with the bottom cut off and airline through the lid. Took awhile to get the heights of everything right, but it does work quite well for generating a nice volume-wide swell... and is indeed pretty noisy (toilet flushing...

I read it, I just still don't quite get it, or at least, that description is off. It's still the air pump that's pushing water out of the chamber, no?: and it would be doing that balloon or no balloon. And I don't get quite what is attached to what in the setup: the balloon goes onto the rigid...

Another option to add to the DIY list: a Reverse Carlson Surge Device. http://216.168.47.67/cis-fishnet/seascope/00SS1705.htm Downside? Loud (well, it sounds like the ocean, right?). And needs to be well anchored.

Ok, so do I have this basic idea correct of how water is slowly pulled up and then dropped back down via gravity when the pressure releases? Theoretically, two of these devices could be linked together on opposite sides of the tank: one pulling up while the other drops down, minimizing the...

Originally Posted by 1journeyman The Wave2k is a great wavemaker. I've got it. Sadly, I'm not talented enough to make one. Yeah, I have to agree that this looks like the all around best simulation of wave motion you can buy. It's a pity that it's so complicated (well, it's not rocket science I...