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This is possible, especially with a regular refractometer designed for brine solution and sugar solutions. However for a properly made and calibrated refractometer for seawater application, it is spot on if you use it properly. Yes, but also, these will only be present in our reef water at very low concentrations. So it's not that much of a problem. This is actually fairly tricky, because microbubbles or another other inclusion in the liquid between probe junctions are going to mess up the conductivity reading. Also, the probe need to have temperature compensation and be properly calibrated to achieve a good reading. So pros and cons I guess. Anyway I'm splitting hairs here. Either instrument is good, and we just need to keep the reading from drifting. So even if the absolute value is not correct, we can still monitor the consistency.

Agree with earlier comments - compressor / drop in coil for 5ft is the most practical option. Personally i have a 1hp Daikin compressor next to my tank. The hot air in an apartment isn't great but got used to it. One thing to note is to design your sump such that you get good flow across the drop in coil for maximum efficiency.

For a 5 foot tank, I wouldn't consider anything other than a drop in coil. You just have to size the correct HP. My 3 feet outdoor tank takes just 17 mins to cool down 1 degree at mid day. I use a Dailkin 1hp . Sent from Singapore Reef Club mobile app

The worst chiller would be one under powered for the task. Not only would it not be able the chill the tank, it would be on all the time using up electricity and venting hot air, which would be made worse if you keep the chiller indoors. A bad chiller would have no secondary temperature control to attach to, or has been plumbed in such a way that makes it inefficient - such as the chiller input and output run to and from same chamber for example, or feed pump is inappropriate (too fast or too slow). What I am trying to say is that even a good brand chiller implemented incorrectly would make it sub-optimal. That said here is my take on some brands Teco brand is very popular world wide as it is both reliable and good performance. The TK500 should be capable of happily keeping a 5 foot tank in perfect conditions, although is pricey. (It also has a built in heater). Hailea is another popular brand much cheaper, personally I have never had an issue with them my hp66a runs a 500L system and has been sat outside for 3 years and worked perfectly fine. They have just updated their model line so worth checking out. Other brands such as Artic also available (I never owned one so cannot comment). Chillers with own compressors and coils are possibly the most powerful and a lot of people use them here in Singapore. They typically range from 1hp to 3+hp. The only issue is inital cost (although they do pop up on the forum so good bargains to be had), running costs (can easily be kept down with external probe), installation placement, and ensuring coil is appropriate for reef tank (titanium coil is best), but they are easily serviced by any AC tech. Chillers arc in my mind essential. Not only do they keep your macro environment stable, but also cooler temps help keep dissolved oxygen levels optimised. So good luck in your search.

Feel free to pm to trades, looking for most of the zoas except those in the list below, and looking for diff types of sps/lps too My zoanthids list: Aoi Salted agave Buttkissers Bowsers Rainbow hornets Red hornets Blue hornets Purple hornets Fiji Jawbreaker hornets Grandmaster krak Speckled krak Voodoo Dayglo volcano Exosphere Peridae Petroglyphs Pink hallucination Van helsing Rainbow vdm Gobstoppers Hyper jubilee Rainbow incinerator Fiji dragon eyes Valentines day massacre Utter chaos Blood sucker Oz enzyme Seduction Supernova Rainbow infusion Gold dust/pandora Pink Alien anti venom Purple monster Sunflower Vamp in drag Goblin on fire Fruit loops Boston celtics La lakers Vampire slayer Sunkist Sunny d Bowtie blaster Car Yoda Sent from Singapore Reef Club mobile app

Hi, I have the following for sale: 1) Aquaforest Sea Salt 22kg tub (brand new, unopened) - selling $55 only (bought $69) https://www.freshnmarine.com/products/af-sea-salt?variant=18935844208736 2) Aquaforest Sea Salt 22kg tub (left more than 50%) - selling $25 only (bought $69) 3) Vitalis Platinum Marine Pellets 140g (1mm) , brand new unopened, new packaging, expiry July 2022 - $20 only (bought $28) https://aquatics.sg/products/vitalis-platinum-marine-pellets-xs-1mm-120g?_pos=3&_sid=dfb940172&_ss=r 4) Vitalis Algae Marine Pellets 140g (1mm) , brand new unopened, new packaging, expiry Oct 2022 - $20 only (bought $28) https://aquatics.sg/products/vitalis-algae-pellets-xs-1mm-120g?_pos=3&_sid=07b38fef8&_ss=r 5) Dr Bassleer Garlic Bio-fish Pellets 150g, M (0.5-0.8mm), brand new, unopened, expiry Aug 2024 - $12 only (bought $17.90) https://www.freshnmarine.com/products/copy-of-dr-bassleer-biofish-food-garlic?variant=34941321354 6) TDO Chroma Boost Pellets 85g, X-small pellets , brand new, unopened - $14 only (bought $20) 7) Seachem Cupramine 100ml , brand new, unopened - selling $12 only (bought $16.70) 8) Vibrant (by Underwater Creation), left 80%, - selling only $45 (bought $80) https://aquatics.sg/products/underwater-creation-vibrant Please PM me if keen. Kindly self collect from Tampines. Thank you.

Up Sent from Singapore Reef Club mobile app

Used - $50 Zetlight E100 (White LED) The Zetlight E100 is an aquarium LED lighting to promote the growth of algae. It features a fresh new design with flex neck, suitable for all tank size. Benefits Strong illumination and penetration The high-quality Flex Neck is secure, strong and resilient to flexing. Specifications Beautiful light suitable for planted tanks and sumps Item Size: 11 x 3.7 x 1.34in LED: 1 White Power: 12W Lumens: 1000LM Color Temperature/wavelength: 6000K Illumination area: 35x35cm square Suitable glass thickness: 4mm-32mm Dimmable Package The package includes: LED lighting unit Flex Neck Wired Dimmable Controller

Forgot to mention, water a bit cloudy due to addiction of sand in the morning. Also, light is on for the purpose of photo taking only. Salinity is 1.015 now during cycling phase as per Dr Tim's advice. Sent from Singapore Reef Club mobile app

All washed and ready to use. Selling for $170/- Collection @ woodlands Interested pm/ WhatsApp 96ninenine22fiveO