I would not buy a tang online, just my opinion. When you buy a tang ask them to feed it, to see if it eats. This is a MUST. 2nd wait a day or two and ask them again. Ich usually is not that bad depending on your tank and garlic will usually kill it. I have a yellow & hippo. The yellow never got ich but the hippo did (very light) I heard that high temps + garlic = dead ich and it worked. Yes powder blues are usually way harder to keep.