I can't wait to see pictures of your kreisel in action. Congratulations on a well-executed design, and I'm pleased to hear that your life beyond reef keeping is so satisfying as well. All things in balance...
I recently purchased a 2.5g glass tank for the breeder, from a national chain that I will not name. While there, I picked up a couple things I want to share with you.
I thought it might be handy to have a smaller tube of silicon for gluing in the screen. I have seen this tube before and assumed it was clear. It's BLACK. Interestingly, it says no where on the tube that it is black. Perhaps it mentioned it on the blister pack it came in. I do not know.
While collecting my supplies, I took a look in their saltwater aquariums. One tank contained a Chocolate Chip Sea Star. It was on it's back, lying on the sand, all arms curled back, and contents spilling from its mouth. I informed the attendant that unless they were feeding it to a Harlequin Shrimp, then it was a casualty that needed removing. The attendant thanked me for noticing, proceeded to flip it over, then said "It fine, it just fell off the glass." While these sort of stories are not new for that chain, I can only hope Hitler and those like him have been continuously reincarnated as the spineless inverts in their tanks.
Just so you know. :]
Also, here's some help when cutting nylon mesh.
You can't mark it with pencil and you probably shouldn't mark it with marker. So draw the lines you need on a sheet of card stock, tape it down, then lay your mesh over your outline and tape down the corners. Now you can cut your pattern with a box knife. Note: do not use any portion of the mesh that came into contact with the tape; adhesives can be toxic.
Congratulations on getting it working! If you are going to have this on a broodstock system, I would at least filter the water before it gets to the kreisel. There'll be tons of detritus in the broodstock water (if not initially then eventually) and you don't want to clog the kreisel. The planktonic forms of some hydroids are _tiny_ though. (I have a video around somewhere that's probably a hydroid medusa if you'd like to see it.) From what I recall, much smaller than a rotifer, so you won't be stopping those with any screen that doesn't need to be changed very, very often.
I have no clue what size BVN are. They have veliger larvae, though, just like snails. If they feed in the planktonic stage (if they _have_ a planktonic stage), I would assume that it'll be on phytoplankton of some type. So, I would assume that you are going to need to fill (and retain) a lot of phyto in that kreisel while they are planktonic. On the other hand, slugs like Berghia don't feed while planktonic so you might luck out there. But I would plan for the ability to isolate the kreisel tank from the rest of the system so that you can just turn that tank dark green (or brown) with phyto when necessary. You wouldn't want to include your broodstock tank in that.
Again, I'd like to urge you to consider keeping your two systems separate. In the ocean, all these larvae are way up near the top of the water column, far away from any solid surfaces where filter predators would live. You can't replicate that. You are designing the perfect home for small filter feeders and larvae count as good food for them.
I knew you've been holding out on me. Thank you!
I know the photos above probably aren't the ones (note: now there's a funny word.) you were hoping for. So allow me to reiterate. This is not a battle for a one man army. What success in this endeavor will require is ample experimentation. That means I need you.
It is entirely possible that someone before me has in fact discovered the proper BVN cue, but never knew it, because their kreisel sucked bilge. While I have a great deal of confidence in my design, there is really no reason short of divine inspiration to believe my design is somehow the "right" one.
If you need an incentive beyond discovery, then here it is. Breeding BVN can't be patented, but a kreisel most certainly can. When FWE stops working, the right design could be worth a fortune $$$.
That said, I'm not going to show you my loc-line and screen design just yet. To put it simply...
I'll show you mine if you show me yours!
Edited by Whys, 17 April 2011 - 01:04 PM.