I'm pretty lazy too when it comes to this kinda of tank maintenance things. I used to dose with Reefmax A, B, C, strontium and iodine. Later cut down on the strontium and iodine. I think those are really not necessary if you do water change with marine salt. Right now, I'm trying out Brightwell Elemental which contains pH buffer, Ca, and Mg. Although I think the Mg level is not high enough for this particular additive. I'm getting like 1260ppm of Mg but Ca is at 440ppm. I probably have to get additional Mg additive in future. As for dosage frequeny, I will usually do a test first before deciding whether to dose. That can be like 1/mth depending on my free time. I'm doing my water change now with NSW from Irwana. Just changed 10% after 2 mths running.