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I'm really hoping someone says, "no, that's a <whatsamahoosit> and they're really safe", but I have a bad feeling this is bubble algae...I only see one, and it is about the size of a pea...feedback appreciated...

I have two photos here, one has some clear slimy looking stuff, and I'm wondering is that a sponge, algae, or something else? The other shows some tube worms, and I'm curious exactly which kind of tube worm they might be? Thanks in advance :)

I now have about 4 of these throughout my tank, 1 on the filter, 1 on the heater, and two on the back wall of the tank. They are about a half an inch long, white sponge? Or is this some detrimental organism I haven't seen yet? Thanks for the feedback :)

So I need some advice. My Nitrates are consistently at 40. I make my own water from tap, but that tests 0 for nitrate, I have done oodles of water changes, with no effect. I have a HOB filter and a canister. I have cleaned out the canister recently, and even added stones to reduce nitrate. I...

Hi all, in the three photos below there is a starburst shaped thing in the middle of the photo on my rock. Sorry about the photo quality, had to take the pic at an angle, and the glass reflected. Should I worry? Doesn't seem to be a featherduster, and though I have some zoas nearby, I have only...

Just found this little guy while peaking in with the lights off. I know there are some dangerous snails out there, as well as good. Anyone know which this would be. Here are some pics, it is about the diameter of a dime. It's got the color of a Collinista (good) but the shape of a Pyramid Snail...

Though I have had no unfortunate deaths to fish, coral, or inverts, nor huge algae bloom, my 55g is consistently showing about 40ppm nitrate. Nitrite and ammonia at 0, PH between 7.8 and 8, sal 1.023. I make my own water from the tap, but have tested the water out of the tap and it is perfect. I...

Just brought home some Mushrooms, and this is all over the rock. Am I correct in IDing this as Bryozaon? Thanks in advance for the input. :)

Found this thing on my filter this morning. It's gray, about half a centimeter long, and seems to have two orange antenna sticking out of it's head. Sorry pics are so bad, can't get a better one. Anyone have any idea what this might be? Thanks in advance for any input...

I am using test strips that measure alkalinity in ppm. The "ideal range" according to the chart is 180-300ppm, mine is consistently between 250 and 300, but how do I convert that to dKH?

So, the orange stuff...diatoms? If so, I have read "less light and less food". Will that be enough?

So, I'm showing some high calcium levels and have a few questions. First, here are my levels: Spec Grav 1.024 Ammonia and Nitrite 0 Nitrate 10 Alk 280ppm PH 7.8 and Calcium just over 520 Questions: 1) As long as PH stays ok, will my fish and inverts be ok? 2) This was after a tank upgrade in...

OK, so what is this bug-like critter, and should I worry?

Just wondering at what point the calcium level is too high for coral (or fish). I only have some Zoas, Shrooms, and a Kenya (in additiona to my fish), but I intend to add more coral. My calcium was optimal for the longest time, but I recently upgraded my tank, and when I tested the water a few...

It looks like a bunch of amphipods or some such lifeform, have started "spilling" over from my refugium to my tank. Should I be worried?

So, I've been wanting and needing to upgrade my tank, and just found a 55g with stand, Topfin 65 HOB filter and 2 All-Glass lights, with 16" bulbs, all for $100. My question is this, it looks like the bulbs are 15w T-8 fluorescent bulbs. As I said, there are two and they are 16" each...will this...

I have 2 clowns, a damsel, a goby, and a coral beauty angel. I noticed today that the black edge of my larger clown's tail is missing. I originally had two clowns, but one jumped and died, I replaced it with one that was smaller several weeks ago, the fin problem is with the bigger original...

I know someone posted a very good guide to hitchhiker's on a different thread. I just wanted to share this one as well... LionfishLair.com - Hitchhiker Guide to your Aquarium

So to you once again my esteemed, knowledgeable, fellow aquarists, I ask, should I be concerned about this brown stuff on my giant zoanthid and/or the hairy/grassy stuff hiding underneath (which I only just noticed after taking this pic). The zoa seems healthy enough, but I want to be pro-active...

Last night one of my clowns jumped from the tank. Was a pretty good leap too, getting past the HOB filter and the refugium on the back, and with only about 3 inches between the side of the tank and the light. Unfortunately, it died, and the other looks thoroughly depressed, just hanging around...