20 gallon

Hello! I have my 20 gallons IM AIO 4 months ago. Everything went good until like 2 weeks ago. I start having issues with the alkalinity all the other parameters are stable but the alkakinity is going up every day. Today: -O2: 8 mg/L -Sal: 1.025 SG -Alk: 11.8!!!!! ??? (It was at 11.2 and is...

I’m looking at starting out with a 20 gallon saltwater tank here soon. I want a pair of clown fish for sure as well as one more type of fish, and 2 live coral. Maybe 3 coral. As well as 2-3 blue legged hermit crabs. Is that too much for a 20 gallon tank?

I have a 20 gallon, that I’m almost done cycling, from a 10 gallon im transferring two platinum small clownfish, one tail spot blenny and a fire shrimp. I was just wondering If anyone had any reccomendations for what I could add to my 20 gallon. Preferebly I would prefer to add 1 more fish and...

Guys I finally got the first edition! The tank is 13 weeks old, full of copepods and I finally took the plunge with a Firefish! I’ve been waiting for the perfect one as I’m aware I’m limited on options and I think it’s so pretty! Would like to add 3 sexy shrimp in a couple weeks but any ideas...

I have a 20 gallon long tank running for 1 year. It currently has 2 clowns and a yw goby. I have a HOB filter, protein skimmer, and oversized UV light. I would like to add some colorful and practical fish. Here are a few possible additions I came up with, which one do you all think will work...

Hi everyone, I posted recently and a lot of you had great answers so I’m asking more questions. I’ve only ever had beta fish before and that was an extremely long time ago. I was going to get back into the hobby and get another beta when I found myself in the position of inheriting someone’s...

I have a nearly 2 year old Waterbox Cube 20 with the matching white cabinet stand. It was actively used for just under a year and then I moved to the east coast after taking down the reef. It's been in my mom's office ever since (climate controlled) and it's time to sell it since I'm home for...

Hey there, I’m starting a new tank and would like to document it separately from my past builds/main build thread. I’ve been out of the hobby for about two years. Now, a few moves and a divorce later(but no worries, much better off!) here I am, back on r2r and making another tank :p;) In my...

my ideas so far are a possum wrasse and maybe a Griessingeri Goby, any suggestions would be appreciated.

I’m currently on my third going to fourth week of cycling and my ammonia reads .25 and nitrites is a deep purple kinda hard to tell which one it is and my nitrates is about 10-20 ppm and it’s been stuck like this for about a week. I did a 25% wc then a 50% 2 days after and it’s still reading the...

Hi all, I have an Aqua One AquaNano 60 Tank (20 gallon) marine tank currently just with live rock and fish. I’m looking to add some corals (especially an anemone as I have a pair of clowns) and was wondering what the best budget light is to get? I am based in the UK and many US recommended...

i Have a single maroon clownfish in a 20g high. Two people told me it’s too small, but only two. Were They right? Should I upgrade? will my fish die if I don’t? I want the best life For my maroon so I’ll do it if I have to

Should I buy a long spined urchin to go in my 20 gal with 2 clownfish? Is it overstocking it? Will the spikes harm the fish? Sorry, I'm a noobie

Hello reefers! I have started a 20g reef tank and it quickly has become sps dominant. I have a 20 gallon aio waterbox rimless with the stand. It truly is a beautiful tank they make. I will post my build and progression. I am looking to upgrade my flow but I’m still looking for the perfect...

Hey, I'm currently cycling my first tank - this 20 gallon JBJ cube aquarium. https://www.bulkreefsupply.com/20-gallon-nano-rimless-aio-aquarium-jbj.html I understand that nano tanks aren't preferable for beginners but I'm going to keep on top of weekly water changes and testing, but I wanted...

Hello all! Thank you for checking out my salt water journey! I have a lot to learn am excited to see what happens! I will be listing details in this thread of major events of the tank (dates of set up, new additions, w pictures!) Note that all equipment was cleaned prior to any use. Please also...

Do you have a 20 long, if you do lets see what you got :)

Hey, I am trying to figure out what this stuff is on the sand bed, I was told its a buildup of calcium, so I got something to deal with the buildup, did a few water changes and its still coming back. Am i doing something wrong, or should i do more water changes to get rid of it? It seems...

Hello everybody, I recently have fell in love with puffers, and I was wondering if I could keep a blue dotted puffer in a 20 gallon long? Thanks!

Hey everyone, So I started this tank in August, so far everything is going great, We upgraded from a 10 gallon to a 20 long, added some new coral (Soft only) as well a Royal gramma who seems to be fitting in really nicely. This is from the 10...

Looking to put a very small Toby puffer (leopard or Valentini) in a 20 gallon. Only for a year and then will be moving and upgrading. Would it be possible to get a blenny as well? I hear mixed reviews on Blennies in 20 gallons, I know 30 is usually the minimum recommendation. Thanks!

Hey guys! I have a 20 gallon tall tank that will be a reef tank, for coral I’ll probably mostly do zoas, at least one pulsing Xenia, a duncan or two, and maybe a hammer coral. The tank has been cycling for about 3 weeks and I’m getting ready to start adding fish. I for sure want a pair of...

I’m making a new thread because my last one is sad and gets no attention. I got new lenses today though and love how my coral look with them!

So I have a 20 gallon and my sister insists we need a yellow tang. I've already had to break it to her that the tank is waaaayy too small for yellow tang or any tang in general. I was considering a Midas blenny as an alternative. What other options are there for a yellow fish in a 20 gallon?

Good morning everyone. I am reaching out to get opinions on the best nano protein skimmer. Got myself a 20 gallon water box aquarium. Going to have a heavy bio load. I am selling my house and currently have a 40 gallon breeder which I don’t want to give up my corals. So at my temporary stay I...