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1. Changing 25% of the water once a week is typically reccomended. This may vary though if your tank is overcrowded, has no filter, etc. But it's safe to say that 25% is usually fine. What you could do is go to aqadvisor.com, put in what type of tank you have and fish (or fish you plan to keep)...

My favourites are the rummy-nose tetras, but I'm not sure if they'll become lunch to your angel once it gets large. They eat them simply because they are small enough to fit in their mouth - many/most fish are like this. Go for larger tetras: * Black neon tetra * Strawberry tetra * Emperor...

My favourites are the rummy-nose tetras, but I'm not sure if they'll become lunch to your angel once it gets large. They eat them simply because they are small enough to fit in their mouth - many/most fish are like this. Go for larger tetras: * Black neon tetra * Strawberry tetra * Emperor...

My favourites are the rummy-nose tetras, but I'm not sure if they'll become lunch to your angel once it gets large. They eat them simply because they are small enough to fit in their mouth - many/most fish are like this. Go for larger tetras: * Black neon tetra * Strawberry tetra * Emperor...

My favourites are the rummy-nose tetras, but I'm not sure if they'll become lunch to your angel once it gets large. They eat them simply because they are small enough to fit in their mouth - many/most fish are like this. Go for larger tetras: * Black neon tetra * Strawberry tetra * Emperor...

My favourites are the rummy-nose tetras, but I'm not sure if they'll become lunch to your angel once it gets large. They eat them simply because they are small enough to fit in their mouth - many/most fish are like this. Go for larger tetras: * Black neon tetra * Strawberry tetra * Emperor...

As others have said, possibly a platy. They are tropical fish and require a heater in their tank, as well as a filter. You can feed tropical flake food. They are happier with a few more platy friends. I hope that helps. :)

That sounds normal, new or not. They are nocturnal fish and spend a lot of their time hiding. If you want to see more of your ghost knife, put a piece of slate or something similar against the front glass and he may hide there where you can see him.

Are there any small schooling fish that I can add to my large coldwater tank? It has two goldfish. If not, what if I added a heater and raised the temperature to say, 18 degrees celcius or something? What that give more choices or would that make the small fish or my goldfish uncomfortable...