Tank in trouble? Please advise

Jasonlseward

New member
Hello, first thank you all for your help, I'm baffled at the moment

I've got a reef setup, 100 gal display, 50 gal sump. System has been in place and stable for close to 4 years. About three weeks ago I noticed my Candy coral starting to decline. Water parameters all checked out, except that the TDS on the output water from the RO/DI that tops off the tank was way too high. I changed all the filters and RO membrane, did a big water change in the tank. About a week after that I noticed the water temp at 86°F. I suspect thermostat tampering on the part of my two year old, while I was emptying the skimmer collection cup. I don't honestly know how long the temp was elevated, my guess is three or four days. I brought it back down over the course of 48 hours. This was after the initial decline in the coral.

So I corrected the water temp, the candy seems to be maybe making a slow comeback, hard to say. But today I noticed the Sailfin tang and the Yellow tang both have damage to their dorsal fins. They used to fight occasionally, but that was years ago. Nothing new has been introduced in a long time, so I doubt disease, but I don't really know.

Tank has the two tangs, a clown, a construction goby, the aforementioned candy coral, a big frogspawn, a few purple mushrooms, and assorted zoanthids. The other corals seem fine.

As of this posting, nitrate about 20ppm, nitrite 0, dkh about 8, ph about 8, ammonia 0, sg 1.023, temp 78°F, I'm out of drops to titrate the calcium, so I dunno, but last time I measured it was about 400, I think it's fine.

Pictures attached, please excuse the Aptasia. I introduced the Goby about two years ago, all the shrimp quickly vanished and the Aptasia has been a burden since then. Suppose Aptaisa-X could be a factor?

Thanks again,
Jason

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