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It's easy to verify. Use a multimeter to check if there is voltage out of the power supply. Multimeter is cheap and you can use it for other things. I have a Chinese LED you can borrow. You can also borrow my multimeter.
I have some. This is the stuff from ACC, 3mm. Very nice size sand that won't blow around. With some shells mixed in. Just light rinse. $1 lb I have about 25lbs left.
If it's diatom on the glass could it be PO4 issue? And the acro browning might be nutrient related as well. Nice setup. The polyps looking great. I notice you have them higher up in the tank instead of on the bottom.
DSA I think it's gone. Most of the custom shops will be 4k+ for a tank of your size, not even including the stand. Stock tanks are a lot cheaper. 180g perfecto is probably the most versatile tank. Really depend on what you're looking for. From what you've written looks like you want a tank with...
haha I know what you're talking about. But it seems you have a pretty big budget after all if it's only half of it. C2C does make some fantastic setups that make the price justified. Same reason people drive BMW while a Honda will get you from A to B as well.
Great choice on the lighting...
Build your rockwork using epoxy etc then put it in your 90g for a couple of weeks. It's a smaller amount of rock so your 90 can handle it in the mean time you have the rock cured and populated with pods.
You can do water change but you cannot do enough to dilute the nitrite. You can move remaining fish to a small tank with new water. Treat tank with dr tim's. No more feeding until nitrite is gone.
Tank move, new fish, new rockwork, new water. So many things going on at the same time. Fish stressed out.
Right now if I were you I would leave the tank alone and observe. Identify the disease then take the next step.
I feed my fish frozen food including frozen blackworms. More than one occassion I have tangs showing sign off Ich after introduced into DT and cured themself after a couple of weeks.
I am pretty sure Ich exists in my tank. But it doesn't seem to multply fast enough to cause any problem.