Zebra Danios and Silver Hatchetfish are great additions to a tank for the top layers.. the general rule of thumb for top-layer fish is any species with an upturned mouth, they only eat from the surface of the water and so tend to stay in the upper levels.
thanks everyone! I never thought about the upturned mouth, but that makes sense! I've only got 2 cherry barbs in this tank now, and they are sooo timid. They have shared a tank with my other fish, and were timid, so I put them by themselves, and they are still hiding most of the time...I plan on getting 3 more cherry barb, and something that swims in the upper part of the tank...I also think I need something to eat the brown algae that keeps growing on my rocks and bubble wand...I really appreciate
all your suggestions!!
Denise Cherry barbs are a little shy anyway and will appreciate more of their kind and well as some plants(real or artificial) to hide in. Otos love that brown stuff growing on your bubble wand
As for the top water I have three kinds of Danios(Choprae, Kerri,and Roseaus)in my 55 gallon for top water dither fish and they all school together and I love the business that tank.
thanks Butterfly, I have 2 fake plants (but they are sparse) and a ruin shaped like a house, and a little tunnel made out of 3 rocks (2 sides and a roof)..one cherry hides in the house where I can hardly see him, and the other hides in the tunnel. I used to have 3 cherry barbs but 1 died, so maybe with a few more playmates they will come out of hiding.
I appreciate you telling me about your danios! I'll look them all up so I can see what they look like..the Petsmart here only has zebra danios and I would like to see other varieties.
I believe I've read I'll need 2 or 3 otos...would 3 be too much for a 20 gallon? also do they prefer sand or gravel? I want to change my substrate, as it is the multi-candy-colored gravel and I think it detracts from the fish.. thanks!