Yesterday morning the male T. nudus goby was back out with the female again so I knew immediately that the eggs must have hatched at some time during the night. He had been caring for them non-stop for the last 7 days without eating so I was expecting something to happen within the next two days. I checked on the tank 2 hours after lights out the previous night but there was no sign of any fry at that point. When I checked again in the morning there were a few tiny goby shaped objects floating around the tank and one was even still wriggling but it was swept away by the flow before I could reach for a pipette to catch it. Unfortunately the fry don't really stand much of a chance of surviving intact by the time I get up in the morning to look for them. The powerheads are so fierce and the fry are so delicate, not to mention that I now have a shoal of hungry Cardinals that are always on the look out for any tasty morsels that happen to float by. I expect that they had a breakfast feast yesterday and the Acanthastrea looked suspiciously happy too!
At least I took better notes this time so I'm fairly confident now that the egg incubation period is 7 days so maybe next time if I stay up late or get up really, really early I can actually catch and photograph some.....
After waiting absolutely ages for delivery I was finally able to set up my shiny new GHL Profilux 4 controller over Easter. The hope is that when the time comes I can monitor the tank whilst I'm away, so less worry for me. At the moment I just have it set up with four probes measuring temperature, pH, redox and conductivity.
There is just 0.1 degree Celsius difference in temperature readings between the digital GHL probe and the Simplyaquaria temperature controller which is pretty good going considering the price difference between the two. I am going to keep the Simplyaquaria controller running as a backup to the GHL, two alarms are better than one in my books. I may actually move the Simplyaquaria probe to the DT so that I have two separate temperature readings to compare.
The conductivity of the tank water measured by the GHL probe was 51.8mS which converts to a specific gravity of 1.0257. My calibrated refractometer measured it to be 1.026, again the values are pretty close which is good. I am happy to know that I've been maintaining a suitable salinity using the refractometer.
I never bothered to purchase a pH test kit this time round so I had no idea what the actual pH readings were going to be. The levels are fluctuating between 8-8.2 or thereabouts, I would like to study the whole 24hr cycle but haven't managed to work out how to access data from the Profilux yet (if indeed it's actually possible to do).
The redox probe is still bedding in, to be honest I'm not really sure what to expect from the readings as I've never used one before. It came with the set so I thought it'd be interesting to set it up and investigate what it can tell me about the tank.
On the livestock front, Charlie the hitchhiking hermit crab is now on borrowed time after his first tank misdemeanor yesterday. He knocked my prize Acropora gomezi frag off the rock in his quest for food. I supposed I should be pleased that he just wanted to graze off the rocks and not eat the coral but still it's annoying. He's really quite big now so I'm sure that he'll cause more trouble in the future if I don't try and catch him now.
I think the T. nudus gobies have spawned again, Hop has been sequestered in the cave for the last two days and Skip won't let him out to feed, so I'm hopeful that there are eggs hidden inside. I hope I actually get to see some fry this time round, pretty please! The Cardinals also appear to be courting but there's been no further release of eggs.
Daddy Cardinal made it all the way to the end of the 6th day mouth brooding the eggs and then on the morning of the 7th day they were gone. Soooo, did he get a bit peckish overnight and eat the eggs or did the fry hatch out and he released them?? I just don't know, it's really quite frustrating. First I missed the Nudus goby fry and now the Cardinals too.
Talking of the Nudus gobies their latest attempt at spawning (maybe) ended at day 4 thanks to the pistol shrimp who decided to fill in the entrance to their cave again. Following that disruption the gobies went MIA for 4 days and then both reappeared as normal. I wish that they'd just move over to the left hand rock pile and then they wouldn't be bothered by the shrimp's digging activities at all.
Here's some pictures of the proud Father. It remains to be seen if he can carry the eggs for the full 7 days without eating them. Every now and again he will partially spit the eggs out, juggle them around a bit and then suck them back in again. It's really cool to watch.
Hi, my name is Lisa and I live in Derby, UK. I am a self-confessed reefaholic!