I have so many snails in my tank I dont know where they came from. How to eliminate those? Are they harmful to my fish?
No, they won't harm your fish. You just need to control overpopulation by cutting down on how much food you're putting into the tank. Overfeeding is what lets the snails get out of control.
I have my 20G tank, 10 tiger barb, 1 dwarf gurami, 8 dino zebra(Im not sure if it is dino zebra coz it is orange in color)
i think hes referring to Zebra Danios, and you're correct he is a little overstocked. those tiger barbs will get MEAN and something tells me the danios and gourami will eventually become food.
Tiger barbs may stress the other fish to death, but they will not eat them live.
but as per snails, you can do a few things:
-bait them with lettuce/zucchini/snail jello and remove by hand as many as you can
-how big are they? if they are small (1cm MAX) you could probably buy a few ghost shrimp or rock shrimp to take care of them. No shrimp will get rid of snails. They do not prey on them. The only inverts that really would would be crays (not compatible with fish) or assasin snails.
-remove some fish and buy a loach! i had a red-tailed loach in my 40g tank when my 10g broke out into snail heaven. switched him over and he finished them off in a night. there was a PILE of empty snail shells in the corner