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I was not going to wade into this thread at all but I think we might need a little reality check here.
So a fish died because you made a mistake and you want credit for it? You then say you came clean with the owner, so did you lie at first? This whole thread boils down to "The business did...
Bob Fenner The conscientious marine aquarist is a classic and is updated every now and again
Joyce Wilkerson Clownfish
Matt Wittenrich's Breeders book (Blanking on the name right now)
There are a few more that revolve around coral that we don't have but are fairly well known.
I would say probably negligible either way. If they soaked up phosphates and nitrates, people would just stock their tanks with corals and be thrilled. I don't think they produce too many nitrates because they don't produce ammonia the same way fish or foods would. We do know that elevated...
First off welcome.
Second, there is some very good advice already being give in the above posts.
When we had our first tank, before we discovered a good local store, we did buy distilled water from the shop rite because we were only changing out a few gallons at a time. This works, but is...
4 bulb over a 75g might be stretching for a clam, you might have to put it up higher. I would probably go 2x blue plus and 2x coral plus but that is just me.
Anything that is pure skeleton you can toss. The other ones might have a shot. Keep the diatoms off them and acclimate them back to the light. You can try fragging off the living parts but that could also stress and kill them.
I am not a plumbing guy so I will let someone chime in on that.
Looking at your stock list as far as corals go, you might be able to get away without a ton of extra powerheads as you are not really looking at SPS. I don't know what your return pump pushes, but considering you don't have a ton...
People say the accepted range of alk is 7-12 but that is not 100% accurate. 8-9 is really the sweet spot unless you are running something differently, i.e. zeovit users generally run around 7.
Low oxygen can lead to drops in PH, hence with the closed door it may have led to the drop.