,  this hobby is gutting sometimes. 

Aww shit. 

I know it's probably been suggested before, but you haven't got stray current have you? Seems to be a lot of bad luck for a knowledgeable reefer.. 

Funnily enough, we've not had an unlike button for the same reason Facebook never had one.

Now it's been so long and the general public are largely aware of the like but no dislike button situation, it's now ironically kind of safe to introduce one, everyone now understands that liking a post about something bad isn't quite right, so introducing it now fixes a problem, where as introducing it originally might have caused issues.

It's like a drawn out online version of the Jeremy Kyle show. 

You need to clean up your friends list bud. 

A while ago I got irritated by everyone on my friends list so I unfollowed them, to the point where my feed never changed day to day.  I still follow those I want to, mainly non-family as you can't choose your family, but you can choose your friends. 

Its full of drab shite mostly , people having take a picture of they meal or drink when they go out sad twats,,, i get told i,m sad for going on sites like this

Lost the YT last night, and Clarkii this morning.

Only the blue neon goby left, which looks perfect.  It's a mystery

As soon as I lost the triggerfish, I did a 60% water change to make sure of no ammonia spike.  I did another one after losing the kole, thinking if there was anything going on with the water (I guess there has to have been, but I don't know what) I needed to dilute it quickly to try to save the others.  Too little too late it seems.

I'm wondering if there could have been a pH spike, as I did read somewhere that during hyposalinity, the water is less stable, and large pH fluctuations are possible. I didn't measure this, so it's just a theory.

@Mike , I don't think there's stray current, as I have my hand in the tank pretty much daily, and a lot over the last couple of days, and I've never felt anything.

I can't decide whether to keep the goby or give it away.  It a pain to keep the QT running for one fish for another couple of months, but then again, at least I'd have one fish to add when the new tank is set up, and the other tank and new rock is past it's 12 weeks fallow period (end of Nov).

It can't be anything introduced. You quarantine loads.

If not stray current, there just must be something. It really is a mystery. I wish we could get to the bottom of it. It's beyond bad luck and you really don't deserve it.

You've got more perseverance than I'd have bud.

I was on the verge of packing it all up last night.  I went out, got drunk, and took a deep breath.

Good on you. I've no idea what's going on but I think you should just double check everything, cross reference your hydrometer, thermometer, etc. Something must be happening...

Are corals appearing ok? Is it just affecting fish?