Last night I added a Maroon Clownfish to my tank along with some more snails (total now 5 Astrea and 2 Turbo) and a Fire Shrimp. That's all the livestock that's in the tank right now as it's fairly new. Not long after adding them to the tank they seemed to be quite happy. The Clown was bobbing up and down as per expected and the shrimp had found a little cave to hang out in. The snails all made their way to the rock to graze on algae.
This morning, I cannot see the Fire shrimp anywhere, one of the Turbo snails has seemed to disappear and the clown appears quite listless, spending almost all of his time at the top of the tank. No bobbing up and down.
So here's the best I can come up with as regards diagnosis - There's lots of little crevices etc. that a snail or shrimp (especially if molting which I believe is normal after adding to a tank) could hide away in so I'm not necessarily concerned about them just yet. The clown could maybe have a swim bladder problem ? He seems to get thrown about a bit by the powerhead (AquaClear 402) and the return from my Fluval 404. I would expect him to be able to control his water position a little better and not get bullied by the currents quite as much. I've read that a swim bladder problem could be caused by chilling. The clown spent the night hanging out behind the intake pipe for my canister filter, it's possible that there is not a lot of current there and thus the temperature may be slightly lower than the rest of the tank. (I've put in a second thermometer to check that out) I've currently got a single 200W heater in the center of the tank (which is a 55g btw
) and the intake for the filter is at the back right corner, with the return to its left aiming at the back-center of the tank. The powerhead is at the rear-left corner aimed at the front-center.
My tank cycle completed over a week ago and has been stable at 0 for both Ammonia and Nitrite since then. Nitrate has been about 10-15 ppm
is 8.3 and tank temp is 77. (BTW
- The tank temp seems to fluctuate between 76.5 and 77.3 regularly in case that's relevant).
I think that's all the info I've got. Please let me know if you have some ideas on what's happening. Sigh - this is a difficult hobby !!