Well my girlfriend broke the 20 gallon tank they were going to give me... So the next day I bought a 45 gallon on Craigslist with a stand, gravel, filter for $75. I ended up buying new gravel because I had a hard time removing all of the bleach from the gravel sold to me after I cleaned it. Also I bought a new filter as the one he gave me wasn't ideal for this size tank. But I am beginning to cycle the tank now with my 3 glofish tetra( the label at local pet store said neon tetra no surprise they didn't seem to know much). But I was wondering if I should purchase 3-5 more to make it a school before I finish cycling the tank or should I wait? And I know fishless cycling is the more efficient way but in my case I would of had to keep them in a 1.5 gallon that wasnt properly cycled so I chose to add them to this tank.
I really wish pet stores would stop selling glow tetra as "Cycling fish". They are terrible at it, are sickness prone and spaz in small tanks (yes your tank is too small for they hyper fish) and in such small groups they become neurotic.
When you do an in fish cycle you want just enough to keep it going but not enough to overload the system. What you will want to do is not add any more fish to the 45. Go out and get some live plants such as Water Sprite, Water Wisteria, Riccia, Java Moss, or assorted floaters. Find a few, and put them in the tank, they are not picky about light. This will help your fish ride out the cycle and do wonders to promote a healthy cycle.
Also what are the dimensions of your tank? When the cycle is finished...and if you absolutely must have a pleco your tank may be able to accommodate a single Bristlenose.
These guys don't get as big as many of the other species.