Bought various medications today, one for external parasitic/fungal/protozoan infections and one for internal parasites. The most obvious signs are external so that's the course I decided to take first. Took her out and put her into a plastic tub filled with water from her tank and the appropriate amount of medication added to the water per the directions. Let her remain in the tub for 30 minutes while I did a 50% water change in the tank and dosed it accordingly with the medication liquid, then put her back once all was settled and diluted. I already see a huge difference in the belly wound and the other 2 tiny spots I started noticing on her back -- they went from white with red edges to being gray like her skin and no irritation/redness, so obviously it must be working and killing whatever caused it.
I picked up the CaribSea aragonite sand again for her since she obviously liked it and did well on it previously, although this time I bought the Arag-Alive reef sand with living bioorganisms in it (should survive well since my tank is heavy brackish). It's just as soft and made of the same stuff but FAR less dusty and the particles are slightly bigger/heavier and won't get kicked up and clog the filters. I bought just one bag and did a thin layer on the bottom after removing her (before the water change), and since she's been back in, she's seemed EXTREMELY thrilled with having her familiar sand back again. She's been exploring, rooting, sifting, burying herself, and far more active and content than she's been in the past couple weeks. I haven't seen her upside down even once in the last 24 hours. She also ate one whole jumbo shrimp in one sitting, which is a marked improvement from the little tidbits she's been picking at for the past few weeks. I did buy two new foods: Silversides and "Marine Cuisine", which is a mix of brine shrimp, krill, bloodworms, etc. formed into cubes and kept frozen. She snubbed the silversides both times I offered, but kind of nibbled at the Marine Cuisine cube -- so I'm hoping that means she likes it and will be open to eating them.
I e-mailed Peter Piermarini, the Ph.D. that did the research on sabinas posted in the articles from Univ. of Florida, which are the top results when you Google "Atlantic Stingray". I asked him some questions about his experience in their captive care since most info on the web is in regard to their life in the wild. He replied and gave me some good info -- he mentions that sabinas are not very opportunistic feeders and do not vary their diet much, unlike many freshwater rays. He says they primarily stick to snails, crayfish, and small shrimp (including ghost shrimp, which she did eat for me before) -- which is why she's refused pretty much everything else I've tried. He says she would obviously much prefer live vs. dead food if I can find it, although I'm not sure where I would track down crayfish other than those $20 blue/purple ones sold as pets at the LFS? He also mentioned that while she would do fine health-wise on a barebottom tank, she would much prefer a soft, sandy substrate, which probably explains why she's so happy that I put that similar aragonite stuff back in her tank. I'm hoping this leads to better days and bouncing back to her old self.
The last thing Dr. Piermarini mentioned was in regard to the biological filtration bacteria:
Although the stingrays do fine in brackish water, the biological filtration bacteria (ammonia-bacter and nitri-bacter) are sold as either freshwater or saltwater varieties, and thus do not do well somewhere in between.
What is this referring to? There was nothing mentioned on any of the canister filters I looked at that said whether one was specifically intended for saltwater or freshwater, thus I assumed that everything contained within it (including the media for positive bacteria to grow) would be suitable for either setup. How would I encourage more positive bacteria growth in a brackish environment? I have biomedia in all 3 filters to encourage this, and now the new live sand encourages it as well. Is there something you can buy, like a water additive that would help this process? I cycled the tank for 2-3 weeks before buying the ray and was told this was sufficient time to get the bio conditions going, but now I'm not so sure that it worked the way it should have. What about floating live plants, are there any suited to a brackish environment?