snowrat2004 said:
i want to get 2-3 dwarf gouramis. and get a few more corys also.
now my questions
, how many of each tetra should i get? does it matter if the corys arnt the same kind? would there be room for either hatchets or danios if i got 10 of each tetra? and last but most important, what kind of algea eater would be best (breferably on that doesnt cost very much.
I wouldn't get more than a pair of dwarf gouramis in a tank that size - not enough territory and they'll try to kill each other (believe me - I know from experience). Get either a single dwarf gourami or a mated pair.
With schooling fish it's generally considered that 6-8 is your bare minimum. With neons in that size tank, I'd go for at least 10. With the bigger tetras, 6 would be fine but more would look better. Using the old "1 inch of fish per gal" (which is the formula I use most often because it's a lot easier than working out the surface area etc. and works well for little fish). I don't know what species "black diamond tetras" are but check their adult size - I'll assume it's about 2" as that's a common size for tetras.
In which case, that's about 20" of fish if you have 10 neons and 6 diamond tetras. It's going to be pushing it to get some corys in there
and the dwarf gouramis, and some hatchet fish and an algae-eater of some kind. That may have to be for the next 29 gal tank!
Besides, hatchet fish aren't good at sharing the water with gouramis (or rather, vice versa) since they are all upper level fish and gouramis are territorial.
As for an algae eater, of course corys do eat some algae and SAEs are IMHO, far too large for your tank. Otos could be an idea, since they are very small, but I wouldn't have otos and corys because you haven't got room. I'd suggest either a small school of otos, a school of dwarf corys or a dwarf plec of some kind (bristle-nosed plecs being the easiest IMHO).
Here's a recipe I'd suggest:
Pair of dwarf gouramis - 4"
8x neons - 6"
6x diamond tetras - 12"
3x small or dwarf corys - 5"
Bristle-nosed plec - 3 or 4" (depending on M or F)
Total = 30"
If you wanted extra space, perhaps for more corys to make up the school, get smaller tetras (black neon, glowlight tetras and dwarf characins are all 1-1.5"), get a female bristle-nose and dwarf corys. I'd strongly encourage you not to over-stock if you possibly can avoid it.
Do check with Dick Mills stocking formula to double-check my estimates.