Yes, the times you wouldn't want to use fish tank water are:
- When you've used certain medicines, mostly antibiotics, but to be environmentally safe don't use hospital water at all, ever. Basically, if you have sick fish I recommend using a small (5 or 10 gal, at the most) hospital tank with nothing in it but a simple bubble-powered filter and then throwing away the water (down the drain). Fill the hospital tank with water from your main tank to start, then change out 10-15% of it daily or every other day (unless otherwise noted for the particular treatment) until the treatment is complete and all symptoms are gone.
- If you've used some of the more harsh ph stabilizers; I do not recommend these anyway, but you'll know because it will say on the packaging, "Do not use with live plants"... these chemicals are bad for your fish, as well, so avoid them -- no, really, smoking is bad, too, so is anything radioactive, so no plutonium in the tank.
- If you use a lot of salt (mollies and other brackish fish really love salt and actually require it to breed). This one should be fairly obvious, it'll poison your soil. But, as long as you change your water out at least once a week and use less than a few tablespoons of salt, you should be fine.
- When you've used certain medicines, mostly antibiotics, but to be environmentally safe don't use hospital water at all, ever. Basically, if you have sick fish I recommend using a small (5 or 10 gal, at the most) hospital tank with nothing in it but a simple bubble-powered filter and then throwing away the water (down the drain). Fill the hospital tank with water from your main tank to start, then change out 10-15% of it daily or every other day (unless otherwise noted for the particular treatment) until the treatment is complete and all symptoms are gone.
- If you've used some of the more harsh ph stabilizers; I do not recommend these anyway, but you'll know because it will say on the packaging, "Do not use with live plants"... these chemicals are bad for your fish, as well, so avoid them -- no, really, smoking is bad, too, so is anything radioactive, so no plutonium in the tank.
- If you use a lot of salt (mollies and other brackish fish really love salt and actually require it to breed). This one should be fairly obvious, it'll poison your soil. But, as long as you change your water out at least once a week and use less than a few tablespoons of salt, you should be fine.
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