Reef Sanctuary - View Single Post - How to Make a Safe Water Change for Marine Fish

leebca · 10-12-2007, 06:37 PM

Not a typo jay but it could be clearer.

You want to get within 0.001 specific gravity units of the specific gravity of the marine system.

An example would be a specific gravity reading of 1.025 on the marine system water. The goal would be to get the new water between 1.024 and 1.026 specific gravity units (or within 0.001 specific gravity units of what was measured on the marine system water).

A good hydrometer would measure reliably enough for keeping specific gravity in this range. If yours doesn't, it would be worth switching to a refractometer which is less than $40. or a better hydrometer. If you're using one with a 'swing arm' I'd smash it and tell your sig. other you need to buy a new one (then get either a good hydrometer or a refractometer).

10-12-2007, 06:37 PM	#7 (permalink)
leebca Cabbage Leather Join Date: Jul 2007 Location: So CA Posts: 380 View Gallery Karma Komment	Re: How to Make a Safe Water Change for Marine Fish Not a typo jay but it could be clearer. You want to get within 0.001 specific gravity units of the specific gravity of the marine system. An example would be a specific gravity reading of 1.025 on the marine system water. The goal would be to get the new water between 1.024 and 1.026 specific gravity units (or within 0.001 specific gravity units of what was measured on the marine system water). A good hydrometer would measure reliably enough for keeping specific gravity in this range. If yours doesn't, it would be worth switching to a refractometer which is less than $40. or a better hydrometer. If you're using one with a 'swing arm' I'd smash it and tell your sig. other you need to buy a new one (then get either a good hydrometer or a refractometer). __________________ LEE