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Should consider refraining from buying and selling to one another during these few weeks, along the spirit of social distancing. [emoji51][emoji51] Sent from Singapore Reef Club mobile app

You look to have a great little tank. So assuming tank was all properly cycled. I would focus on four areas... 1. ATO to keep salinity in check, refractometer to check levels... those hanna pens are awesome as can check day or night and they adjust for temperature. Which leads me to 2. Temperature control. A small chiller is ideal 3. A few test kits (nitrate, phospate and alkalinity are key) and 4. Filtration. Both ATO and chiller are simple plug and play options... so let's focus here on filtration given you have a big bio load (i would actually say too big but that is just my opinion. However you have the fish now so let's help you make the best tank possible). So unless you plan loads of water changes (this is not a bad option btw) you would need ; A) mechanical filtration. An ability to remove organics (assume you have some filter floss in AIO), a skimmer (tunze comline 9004 is great skimmer for small tanks. a chemical method to clean out undesirable elements (chemipure, carbon... either in a bag or a small reactor (IM minimax reactor would be good)) C) Biological filtration. I am a big fan of an ATS!! Plus some bio bricks. all this costs a fair bit, hence water changes are actually a reasonable option on a small tank at the start. Eventually you will need a plan to move those Tangs to a larger tank in the future but if they are small specimens (as or photo) enjoy them while you can. Tangs are great utility fish and will help keep the algea down (two tangs in a small space is challenging, as they grow bigger they tend to get more aggressive/territorial... which means you will need to feed more to temper this (hence you need top notch filtration and/or maintence). Unless you quarantined the fish (sadly few LFS quarantine fish) you will need to read up on ICH management techniques, no biggy but best to be prepared. Good luck. What a great start you have made. Keep up with the water changed and keep those nitrates low. Haha. Sent from Singapore Reef Club mobile app

Just keep doing water change every 2 to 3 days. Just 1 x 50% not enough. No need to keep adding chemicals.