Everyone has answered most of these questions but a few are still in answered like-
1. How big and often of water changes?
2. What is a base number of BBS per serving in a 5 gallon? I yea spoon of eggs?
3. What is a good cheap skimmer?
4. Are there any chillers smaller than the iceprobe?
5. Can I keep any other inverts like sexy shrimp? I have also seen people keep "lava red shrimp" with them (I think that is what they are called) I saw them on the seahorse.org website. Are they ok?
6. What corals can I keep with them that they can hitch too that also won't hurt them and can handle cold temps. Gorgonias?
7. What should I use for flow? Do I need anything?
Hard questions to answer and I'm not going to have very good answers for you on these.
1. That's a very individualized question. It will depend on the size of the tank, the number of critters, the type of filtration and the amount of uneaten food. My own tanks even have differing needs. Did you say what size tank for sure?
2. I have no idea of numbers. I hatched batches in 2 liter bottles and threw in enough for a snow storm looking scene. I also decapped my own brine, which I recommend you doing. I don't remember my recipe, but I'm sure I can find in on Seahorse.org. I'm Seahorsedreams there, but admit I have not been active out front in quite some time.
3. No idea. I had a number of smaller skimmers that were made for the JBJ Nanocubes and what not.... none of them worked well so I would buy it again. That was maybe 7 years ago, so there could be new products now.
4. Not any good ones, that I know of. We tried another small one that made similarly to the IceProbe... kindda, but it didn't do much temp wise. It was just way to small.
5. The Red shrimp are probably Hawaii's Opae ula, Halocaridina rubra? I used to get shipments of those once or twice a month. LOVE them. I used them as food for the juvenile "regular-sized" horses. I've never had them touch anything. I don't know anything about sexy shrimp.
6. We weren't keeping much with Dwarfs when I was involved. We were just starting. We were trying to figure out a CUC for them at the time and I'm sure we're way past that and into corals by now. We were testing snails with dewormer to see which lived through it, because of the hydroid issues that often came with Dwarfs. Because of the dewormer, we weren't using corals. The guide in the library, that's about where we were with them when I "left the scene, so to speak.
7. You'll need flow. It will have to be a protected pump or some type of sponge filter. It has to be gentle and you have to protect it from being able to suck in the Dwarfs.
I bet they are smaller than you think they are. I thought I had an idea, but then one year we had them at our booth at a fish conference and I couldn't believe how small they actually were!