I have some macros. I had a huge selection, out in the backyard, and a big branch fell from the Oak tree and broke the tank. I now have Merman's shaving brush, Mermaids fans, Giant feather caulerpa, Gracalira, flat small feather caulerpa, and a few more. I can get the sargassum that grows from rocks out here, and grape caulerpa, blade caulerpa and a few others, but need to go diving to get some. Seahorses need a wider than taller tank, lots of hold ons, such as macros and old gorgonian skeletons. Low flow as they cant swim well. They should be housed with only a pair and have good room. I find just raising your own brine shrimp and feeding is the best. I set up a 5 gallon bucket with about 4 gallons of salt water and inoculate with tetraselmas and nanochlropsis. Hand a 100 watt light over it, drop a couple drops of F2 fertilizer from Florida Aqua Farms or a couple drops of orchid fertilizer a day. When the water gets green, put in 20 or so adult brine shrimp that you buy at the LFS. Dont put in too many. Save the others that you bought to feed for a week until you have millions. They have live birth when fed, so there will be no egg shells. Just get a BBS net and an adult BS net. Take a cup of the water, stack the adult net above the BBS net and pour it through, keeping them seperate. Once they are multipling, you wont need to fertilize, as the millions of shrimp will poop. The water will get very green. I change out-overlap, and never had a problem. Always had millions of shrimp. I used them to feed my neon gobies, banghii carninals and clowns, and all babies. They bred like bunnies! Feed the seahorses often, it wont matter if you feed to much, they will just swim around till they get eaten. The babies might need rotifers to eat, they are raised just like the brine shrimp. After a while they should be able to eat just laid BBS. Hippocampus erectus babies should be able to eat BBS from the start. Remember, the BBS that are 2 days old or less, have more fat than protein, after that mainly protein. Steve.