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My thoughts here are that the fish are impacted by something environmental and not anything to do with the fish animosity themselves.
Just to be clear - you purchased a pre-owned tank that had live rock and live sand for years and are using it currently? or is this a bare bottom...
sps...red table planet...red montipora.
i've seen red gonipora but i believe that coral is hard to keep.
also some strains of sun coral that may be red...but those are non photosynthetic.
vermitid...they are white because they are in the shadow like that. They gain the dark color when they are in the light. At first i was going to guess spirobid but those are vermitid. pita those things if you ask me. One or two quickly become a lot if you feed heavily.
aiptasia are just...
Light is not a big deal. People have shut down their lights in order to control nuisance algae and the corals are fine. It's not uncommon to get multiple cloudy (rainy) days in a row on the reefs in the wild.
btw the reason nerites climb out of the tank is because they are tidal snails. So...
long long time no posts...but i just wanted to report that there is one last captive bred clownfish in the hawkeye household. I thought he was lost with hurricane sandy but apparently was hiding in some live rock in my sump. I cannot move the juvi back to the main display as it was obviously...
i hate helping newbies...HAHAH just joking. the mere fact you don't have to deal with wet dry and underwater gravel system (paul b exempted) means you're ahead of the game already!
It doesn't look like bryopsis. I've never had a fish disease (knock on wood) in my tank but somehow I introduced bryopsis and it was one of the few things (besides hurricane sandy) that made me almost want to quit. It was THAT bad. Anyways what's your cleancrew like? any snails? urchin? I...
Can't add much more to what mnat stated...My advice - if you have a budget, bring cash. If you don't have a budget, bring a credit card. A debit card works as usually there's an ATM nearby...lol.
Also - if you plan on being there the whole day, do yourself a favor and bring a small portable...