A new tank and existing tanks all have one thing in common, they are ecosystems. Knowing how your ecosystem is performing is not so easy. Thinking about getting a new tank and need an experienced professional to shed some light on the topic. Technical testing from Reeves' Reef will get you dialed in to the water chemistry that you need.  Even if you are somewhat new to the marine fish tank hobby. Make the call and sit with someone that cares about getting you started or helping you overcome challenges. Tank testing kits can be expensive and they expire.  Annual or periodic ICP (Inductively Coupled Plasma) testing and standard kit testing of various types will also validate the performance of your maintenance method(s) and effects on your water chemistry to produce the desired results. Reeves' Reef general kit testing and detailed ICP testing when you need it.