Join Date: Apr 2011
Location: Ellensburg, Washington
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Re: Hardiest Tetra
Your plecos will definitively outgrow your tank, commons can grow to about 18"+. If you can, exchange them for a bristlenose. They just aren't good fish for anything less than a pond. Even so, you're going to be pushing your stocking levels.
As for the tetras, try to pick only 2 species max, and then have schools of about 8. So that'd be 3 more neons, and then 8 of your choice. Some black skirt tetras might look nice, although the guppies might be fin nippers. Very hardy fish too.
With the guppies though, you're going to be over stocked in a matter of months, even if they're the only fish in the tank, and even if you only have 1 female (don't, she'll be harassed to death by the males). I personally wouldn't add them, or only have males, but if you do have them, make sure you keep the population down, you will probably have to pull them out and either cull them or sell them. You're going to be pushing your stocking with them IMHO.
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