So, I have been waiting 6 weeks, and the water is finally perfect! Ammonia 0, nitrites 0, and nitrates somewhere between 10 and 20. I'm so stoked! Ph is a little on the high side at 8.2 but does not fluctuate. I have 2 guppies and 2 EG cories. Thinking about stocking 4 more cories same type, and 2-3 fancy guppies. I have an aqua clear 70 for a filter. Is that amount of fish ok for my 30 gallon? Can I get them all at once?