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Old 07-20-2013, 10:13 AM   #141
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I'd give it a 2-3 days between water changes to let things settle a bit As to mixing Temp makes a big difference in the SG. Most hydrometers are calibrated for about 75 degf. Here's a table that will let you know what your true SG is.

Here is the table:

PPT
xx 59.00F 60.00F 68.00F 69.80F 71.60F 73.40F 75.20F 77.00F 78.80F 80.60F 82.00F 84.20F 86.00F

20 1.0145 1.0144 1.0134 1.0132 1.0130 1.0127 1.0124 1.0121 1.0118 1.0115 1.0112 1.0109 1.0106
21 1.0153 1.0152 1.0142 1.0140 1.0137 1.0135 1.0132 1.0129 1.0126 1.0123 1.0120 1.0116 1.0113
22 1.0160 1.0159 1.0150 1.0147 1.0144 1.0142 1.0139 1.0137 1.0134 1.0130 1.0127 1.0124 1.0120
23 1.0168 1.0167 1.0157 1.0155 1.0152 1.0150 1.0147 1.0144 1.0141 1.0138 1.0135 1.0132 1.0128
24 1.0175 1.0174 1.0164 1.0162 1.0160 1.0156 1.0154 1.0151 1.0148 1.0145 1.0142 1.0139 1.0135
25 1.0183 1.0182 1.0172 1.0170 1.0167 1.0165 1.0162 1.0159 1.0156 1.0153 1.0150 1.0146 1.0143
26 1.0191 1.0189 1.0180 1.0176 1.0174 1.0172 1.0169 1.0166 1.0163 1.0160 1.0157 1.0154 1.0150
27 1.0198 1.0197 1.0187 1.0185 1.0182 1.0180 1.0176 1.0174 1.0171 1.0168 1.0165 1.0162 1.0158
28 1.0206 1.0204 1.0195 1.0192 1.0189 1.0186 1.0184 1.0182 1.0179 1.0175 1.0172 1.0168 1.0165
29 1.0214 1.0212 1.0202 1.0200 1.0197 1.0195 1.0192 1.0189 1.0186 1.0183 1.0180 1.0175 1.0172
30 1.0222 1.0220 1.0210 1.0208 1.0205 1.0202 1.0199 1.0196 1.0193 1.0190 1.0187 1.0184 1.0180
31 1.0229 1.0227 1.0217 1.0215 1.0212 1.0209 1.0207 1.0204 1.0201 1.0198 1.0195 1.0192 1.0188
32 1.0237 1.0235 1.0225 1.0222 1.0219 1.0217 1.0214 1.0211 1.0208 1.0205 1.0202 1.0198 1.0195
33 1.0245 1.0243 1.0232 1.0230 1.0227 1.0225 1.0221 1.0218 1.0215 1.0212 1.0209 1.0205 1.0202
34 1.0252 1.0251 1.0240 1.0238 1.0235 1.0232 1.0229 1.0226 1.0223 1.0220 1.0217 1.0214 1.0210
35 1.0260 1.0258 1.0248 1.0245 1.0242 1.0240 1.0237 1.0234 1.0231 1.0228 1.0225 1.0221 1.0218
36 1.0268 1.0266 1.0255 1.0253 1.0250 1.0247 1.0245 1.0242 1.0238 1.0235 1.0232 1.0228 1.0225
37 1.0275 1.0273 1.0263 1.0260 1.0258 1.0255 1.0252 1.0249 1.0245 1.0242 1.0239 1.0236 1.0232
38 1.0283 1.0281 1.0271 1.0268 1.0265 1.0262 1.0259 1.0256 1.0253 1.0250 1.0247 1.0244 1.0240
39 1.0291 1.0289 1.0278 1.0275 1.0273 1.0270 1.0267 1.0264 1.0261 1.0258 1.0255 1.0251 1.0248
40 1.0299 1.0297 1.0286 1.0284 1.0281 1.0278 1.0274 1.0271 1.0268 1.0265 1.0262 1.0258 1.0255

First, this is how it works. You can use a 60 F (59F) table if it is set up like this one.
1. Using the temperature of your tank, go to the column that has approximately that temperature.
2. Scroll down until you see the SG you have on your hydrometer.
3. Now move straight across to the left, until you are in the column that has your hydrometer calibration
temperature (probably 77F for fish store and 59F or 60F for lab grade).
4. Read the SG at the calibration temperature in that column.
5. Now take that reading and go over to the second column and look for that SG reading and note its Salinity. That is the
salinity of your tank.

Example:

Tank @ 81 F (or 80.6 F)_and meter reads 1.022. The 77 F column shows 1.0226 ( rounded off is 1.023). Now look at column 2 for 1.023 (1.0229)_and the Salinity will equal 31ppt.....to low. If you are looking for normal Salinity of 35 ppt, your meter at 81 F would read about 1.025. Normal salinity is 35 ppt @ 1.026 in 77 F water with the meter calibrated to 77 F, so 1.026 -.001= 1.025 for 35 ppt_@ 81 F tank temp using a 77 F meter calibration _

conversion program:

http://www.phys.ocean.dal.ca/~kelle...er/density.html


Good Luck!
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Old 07-20-2013, 02:11 PM   #142
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Another question: I read in another thread that once the tank cycles if you don't continue with an ammonia source the BB will run out of things to eat. I have been at 0 ammonia and frites for a while now. Last weekend when I did the big water change I found a chunk of one of the shrimp I put in to start the cycle. I removed it. Other than my 7 hermits, nothing in there. Still see die off on the live rock though. Do I need to keep a source for ammonia until I add fish? Am I about ready to add a fish or maybe two after the next big water change?
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Old 07-20-2013, 02:18 PM   #143
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PattyG is actually. I used her ipad and didn't know she was already logged in.


Follow up question: I've seen conflicting info on what the nitrate level needs to be before adding a fish. One source says under 40 ppm. Another says 20. I was under the impression I needed to get it as close to 0 as possible. When is it safe?
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Old 07-20-2013, 08:59 PM   #144
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I'd say if you can get to 20 trates or below you are ok to add fish. If you want to add shrimp or another sensitive invert you might wanna gt it even lower. Since you'll be doing a water change soon enough, if you start at like 20 you will have it down to 15 or even less depending on how much you change out.
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Old 07-21-2013, 12:21 AM   #145
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What is a good first fish to start with? When do I add the clean up crew?
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Old 07-21-2013, 11:02 PM   #146
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Ok guys. I still need your help! It will be at least a week before I can drive to Houston to get a fish. Please see my question above ( when I was logged on as Patty G) about an ammonia source.

Also could use advice on what to put in the tank first. CUC vs a fish or two.

Trates are between 10 and 20 now. Will do another big water change midweek and still another if needed on Friday. Then off to Houston on Saturday!
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Old 07-21-2013, 11:06 PM   #147
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Start With Something Hardy

I would start with a clown. They are really hardy fish. Or for a cheaper route, Chromis. They are easy to get rid of if you no longer want them. As a plus, they are cheap. Just don't get a damsel. They are hard to catch, and very territorial aggressive.
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Old 07-22-2013, 08:07 AM   #148
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Toss a pinch of fish food in there it will break down and add a food source for the bacti I like to have my CUC in place 1st, add fish slowly one or two then give the tank 2-3 weeks to adjust. If your adding clowns do both at the same time
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Old 07-22-2013, 09:23 AM   #149
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I put the flakes in and the power head sent them straight across the tank to the overflow box. Will they accomplish the same thing if they work their way down through the sump? I would think no, but I could be wrong!
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Old 07-22-2013, 11:27 AM   #150
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It's a closed system, once it's in the tank and sump it will work. Unless you do a water change and take it out. lol
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