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Has anyone ever done a tank with no filtration, just a power head? Is this a bad idea?

I have started to notice small (2-3mm) whitish grey, flat, oval shaped things on my glass and rock. Any idea what they are? Are they bad?

My tank is done cycling and I am going to slowly add a few snails and hermits over the next couple weeks. Can I start adding some mushroom polyps or some zoanthids yet?

I found a crab in my tank, it's not hairy, but it has red eyes. I haven't stocked any thing yet so i'm not worried about him yet but I have a few questions; - Is it possible for a crab to grow inside a small cavern until it is too big to get out? I ask this because I can see the crab and the...

I recently purchaced a nano12dx from nanocustoms with 4x24watts cf lighting. Just wondering what bulbs would be best for soft corals and zoas, 50/50 or 10,000K ? Also, where is a good place to get this size bulb?

I will be starting off my new 10gal with cured live rock, live sand and plan to seed the substrate with sand from an existing system. I also intend to add a few gallons of water from an existing system. How long should it take to cycle?