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  1. Aqua Splendor

    (Video) XP Aqua Duetto REVIEW - Everything you need know about this Auto Top Off

    Hello, I bought the XP Aqua Duetto, a Auto Top Off (ATO) for compensate the water evaporation from the aquarium. It's a really tiny device, and do exactly what you need. Its also super precise, and despite what the company said about small aquarium and a tiny overflow, it just work perfectly on...
  2. H

    What’s the best ATO for 180 gallon system?

    Yeah what the title says. It’s 180 gallon system volume.
  3. MrsWeathers

    International WTB In need of an ATO ASAP!

    I’m needing an auto top off system, preferably with a pump/the pump that came with it! Don’t need a mini or a nano, I have a 125 gallon DT. Please send me a message with what ya have and your asking price please! Ty!
  4. Cali-Saltwater-1st-Timer

    California ATO Skimmers Reef Octopus eSsence S-130 & 10 Gallon Ruby Trigger ATO Reservoir

    For sale I have a used Reef Octopus eSsence S-130 Internal Protein Skimmer and a 10 gallon Ruby colored Trigger ATO reservoir. Both used for approximately 5 months. Both are in perfect operating condition. New system came with an ato reservoir and required a larger skimmer so no use for these...
  5. Aggro

    Washington WTB Ato container

    Looking to purchase an ato container between 2-5g possibly bigger depending on dimensions but need it to be no larger than a 8-10”wide x 15” deep x 15-16” tall. pm me with pic and pricing to ship to 98597, if price is good we’ll chat. Doesn’t need to be brand name just hold water and look...
  6. P

    Auto Top Off Pump

    Hi I purchased a hydro smart level ATO from EBay. It came with a pump but no tubing. I’ve seen online most people use air line tubing. I’m used to buying things with all the parts so not great with pumps etc. But I’m wondering what I need to be able to connect tubing to this pump outlet? It’s...
  7. MichaelP121579

    Tennessee ATO Return Pumps Downsizing, ATO And Return Pump

    I'm tearing my Redsea Reefer 425xl down. Tank is coming down tomorrow, Reef Octopus Various 6 will ship Saturday. I set this tank up last year around mid January and the Jebao return pump.wenr out in a couple of months, I replaced it with a Reef Octopus Various 6 Reef Octopus Various 6 The ATO...
  8. H

    Custom Overflow Box/Auto Top Off Help

    Hi all. I was hoping to find some ideas/help in regards to setting up a proper overflow/return in my tank as well as maybe seeing some ideas for a diy ATO resevoir and set up! There will be a pic uploaded with this but as you'll see in it, my tank was used as a certain loop in a fewshwater...
  9. Cfellini91

    Kalkwasser Reactor for 25g. Nano

    I recently bought a reservoir and a Tunze ATO and am wanting to try using Kalk. but I don't want to mix it in the reservoir. I ordered the Two Little Fishes Kalk. Reactor 300 from BRS and now am second guessing if this one will work for a tank as small as mine. I know they can get expensive and...
  10. M

    ATO recommendations

    Hey guys I hope everyone is keeping safe and well during these times. Looking to order a ATO for my new Evo I think I’ve narrowed it down between two. the Tunze Nano and the H2Ocean. is one any better than the other? Or is there another i should consider. If you could explain reasoning behind...
  11. Mfield16

    Maryland SpectraPure ATO, 90GPD RODI, UV Light

    Selling a UPLC-II-G6 ATO system. $150 pickup $160 Shipped Spectrapure CSPDI-90-MF RODI System. Triple TDS meter, pressure gauge. Needs media. Membrane has some life left in it. $175 pickup. $200 shipped 8w V2 Vecton UV Sterilizer. $75 shipped. 20200311_081846 by Mike Fielder, on Flickr...
  12. Canuck007

    Bigger ATO or bigger sump?

    Hi, getting ready to set up a 90 (3x2x2) gallon rimless mixed reef. I have 2 options for the setup because of the sizes of sumps and ATOs that I have and space under the cabinet. Should I have a bigger ATO with smaller sump or smaller ATO with bigger sump?
  13. Eg0790

    Help, ideas with Narrow ATO container

    Good afternoon guys, i need your ideas what would you guys use as a reservoir in my stand. I only have 3” next to my sump
  14. B

    California (BNIB) AutoAqua Smart ATO Micro $100

    AutoAqua Smart ATO Micro Brand new in unopened box. Decided to go a different direction with my build. Cost me $143 after taxes, selling for $100 shipped.
  15. R

    Indiana Tunze Osmolator 3155

    I have a brand new Tunze Osmolator 3155 I would like to sell so I can purchase the Neptune Apex ATO. Asking $170 shipped OBO.
  16. Evolve8-ATO.jpg

    Evolve8-ATO.jpg

    Evolve8 showing the ATO box.
  17. D

    California Tunze Osmolstor 3155

    Osmolstor 3155 used, $100 New AF Components 1 + 2 + 3 $30 Reef octopus skimmer DC controllable pump 60 Bubble magus dozing holder 30 3 Fiji pink 10lb sand 25. Unopened I can ship at buyers expense except for the sand and the components. 8187033993
  18. McJaeger

    My fix for stuck ATO sensors and accidentally flooded tanks!

    Hey guys. I wanted to share my solution to a problem I've had a few times since I installed an ATO a few months ago. I haven't seen any threads with this exact fix and I'm a bit new to the hobby, so pardon me if this is common knowledge. I'm using the XP Aqua Duetto as an ATO for my Fluval EVO...
  19. A

    Tons of ATO choices?

    Hi all, I just set up a fluval Evo 13.5 and was looking into ATO's for it. There are so many choices that it's overwhelming. I somewhat narrowed it down to 3 but I was hoping for some expert opinions. The three ATOs I've seen a lot about were the Tunze 3155, autoaqua micro, and the XP Aqua...
  20. BloopFish

    Which ATO to get?

    Was deciding between the XP Aqua Duetto and the Hydor Smart Level Controller, mostly because the XP Aqua Duetto is on sale. Any opinions?
  21. SwiftStorm

    Indiana Tunze 3155 ATO

    Selling my tunze 3155 ato. I bought this off a reefer here for a new build, but just recently (unexpectedly) bought an apex with ato. $110 shipped to the 48
  22. JAM-MAN

    What is the meaning/utility of the "Control Circuit" when Programming GHL Doser 2.1 using GCC?

    GHL's programming terms and logic are somewhat confusing to me as a new user. They often refer to terms without defining them or their function. Control Circuit is mentioned 6 times in the GHL Doser Resource Guide, but its meaning is simply not clear to me. There are 3 Control Circuits available...
  23. reef fish

    Florida Apex 2016 and stuff

    Apex 2016 with eb832 and sensor $650 shipped Atk v1 $180 Shipped Wxm $100 shipped Optical sensor new $25 each Optical sensor used $15 solenoid new 20.00 Used solenoid $15.00 One link cable 13.00
  24. RacinJason

    Texas Vortech, Calcium Reactor, ATO

    Everything is in perfect working condition Korallin Calcium Reactor with Aquamaxx second chamber, 5lb Co2 bottle, Regulator with Solenoid valve. Used for 13 months. $500 shipped Vortech MP60 Quiet Drive with spare wet side and controller mount. Controller used for 8 months and each wetside...
  25. Peach02

    Coralbox A100 ATO review

    i Bought this for 150 AUD or 100 USD, and couldn’t be more disappointed I was under the impression coralbox was a good and trustworthy brand but I stand corrected Upon opening the box everything seemed okay until you set it up with a complete lack of any good instructions you had to resort...
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