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That's the magic of zoanthids. I have two groups. One has grown well, the other has just sat their and dwindled. They can be weird like that.

As I said a long time ago the bumps are normal. They will never go away. That's just the way they are made.

That's a limpet. 99% of the limpets that find their way into our tanks are absolutely safe. For the most part they don't more that about an inch long.

Yep, those are some Palythoa polyps. If the mushroom decides it doesn't like the neighbors it will move itself.

Looks like some pretty cool little tunicates.

Those are pretty basic Palythoa species polyps.

There's really no reason to have the actinic lights on longer than the white lights. If the diatoms don't subside on their on soon then it is likely that your water source is contaminated with silicates, you are feeding with something with silicates (not likely) or some rock in you tank has a...

Diatoms consume silicates that are common in new tanks. They can even be eating free silicate from the surface of the glass when it is new. There is also a certain amount of silicate in the rock and substrate.

They look like colonial feather dusters. Do they retract into a papery translucent tube when disturbed? There are several species that can be prolific breeders. When conditions are favorable they will spread until something stops them.

SPS require very high water quality, and most require very bright lights. LPS and soft corals are generally going to be easier to care for in a small tank.

When you thaw the mysis strain it and rinse it in some clean water. That can help reduce nutrient import as well.

One, I don't really consider 28 gallons "nano", but yes you can certainly keep corals in a tank that size. People keep corals in 5 gallon tanks. The smaller the tank the more work it is, and the more delicate the balancing act.

This is a saltwater forum. Some of us surely have freshwater also, but I don't know how many.

Looks like basic green microalgae. If this is a cycling tank then it is not that surprising.

Those volitans lions are a scourge in Florida waters. They have no predators other than themselves and eat everything. They can be eaten, but as apex predators they concentrate toxins. Who ever introduced them should be out there picking them all up. They are beautiful fish, and nothing is...

Another thing could be the age of your light bulbs. Somewhere around 6-8 months the frequency spread that a fluorescent bulb gives off will start to dramatically shift. That shift often means that the lights will start to give off light that is strongly preferential to certain types of nuisance...

Sometimes nuisance algae can outcompete macroalgae if the nutrient load is heavy. You have to get it somewhat under control so the macroalgae can outgrow the microalgae. It's a pain, but necessary.

It is just regenerating lost arms.

Purigen cannot remove phosphate that is bound to the aragonite in the sand, but the cyano can sit there and suck it out. If you have higher flower hair algae takes over from cyano doing the same job.

This animal was added to an existing tank, and seems to have cause the death of its tank mates. Anemones don't normally release nematocysts the way Cassiopea can. If it's an anemone it will have a foot under the oral disk that is smaller than the disk. If it is a Cassiopea it will be like an...

I use clear 3/8 tubing from the home improvement store as my siphon when doing water changes. It takes a long time to drain 5 gallons, but it allows me to pinpoint what I am sucking up. You should be able to take up a fine layer of cyano while losing a minimum of sand. If you have that much...

A diatom bloom would be a brownish color. Siphon out as much as you can every time you do a water change. The more of the stuff you can physically remove the better. Also, try to get more water flow in the tank. As a whole, cyano doesn't like water flow. Then continue what you would do to...

Looks like it, but it's hard to say with it closed up like that. A firm ID will be much easier when it is relaxed, and opened up.

That doesn't really look like a Cassiopea, though there are 8 species. In whatever light it sounds like it is releasing nematocysts which can be counteracted by carbon.

They don't just randomly kill things. The problem that some pseudocorynactis can pose is that they can get large enough to eat small fish. They are not inherently bad, and there is some other underlying cause of your fish's death.