I want get a small Black Ghost Knifefish from my friend. The only thing is my aquarium is only 10 gallons, but only have 4 other fish, each only about one inch. Also, BGKF is only about 3-4 inches, so fits the 1″ per gallon rule. Also, I will be upgrading my 10 gallon to a 30 at the end of July. So, can I have it in my aquarium for about a month?