So right now I have a successful 20g that has been running for 8 months now. I wanted to upgrade to a bigger tank bc I want more fishes and possibly a blue tang or small tangs like Tomini. I got a good deal on a used Nuvo 40g last week. Haven't said it up yet. I was planning to do 50% water change from 20g to 40g but then I realized I can't keep tang in such small tank. So eventually I'd need to upgrade it to the SR 80g in the next few months. So I'm debating if I should just sell the 40g and make some profit to put it toward the SR80, would take me about 2 months to save enough money for the SR80. But that would mean, I would be doing 75% water change moving the current 20g to 80g. Is that possible or would I be better off just started the 80g from scratch and let it cycle through? That would mean more wait time.