PH Off Topic for Fishies

[Lord-Xanthor]

Sorry about the off topic question, but figured of all places to find out, someone here might know already. My wife for her birthday asked me for a Fish Tank and got her a nice set. Ran everything ahead of time for two weeks but now curious to know on a fresh water tank if using the PH down used for the plants can also be used on a fish tank. Fish are rated no higher than 7.0 and found her tank after calibrating my meter to be at 7.4 and have a gallon of PH down so wondering if it can be used on a fish tank. I found it weird how I paid $30 for a gallon of PH down yet Petco has a 4oz for $40?? Anyway, if you know, please let me know.
P.S. My plants are recovering and show a huge change since I added the plant food yesterday. And no, please don't ever change the name to GrowWeed+FishEasy. Sounds like a snack after a few hits

[growmore]

Only ph down suitable for fish tank would be hydrochloric acid HCl . If that is what you are have then I suggest that you dilute first before using

[Lord-Xanthor]

This is the PH down I have:

https://www.amazon.com/dp/B000FG0F9U/ref=sr_ph_1?ie=UTF8&qid=1490850000&sr=sr-1&keywords=ph+down

[growmore]

That's phosphoric acid and not really suitable and is liable to cause algal problems. You can buy hydrochloric acid from the hardware store Just dilute it about 1 part acid to 9 parts water. Caution always add acid to water and never the other way around.

[Lord-Xanthor]

Thanks growmore . My wife appreciates it. As for the acid to water, that's been ingrained in my head for years. I used to manufacture read/write circuit boards when I was 12 during the c64 and Atari days. I would sell them to the schools at $50 each. That was when people found out you could use the other side of a 5.25 floppy disk. I used to buy out Radio Shacks etchant until I discovered DigiKey lol. Then RS lost my business. I mean my god, I as paying $2.99 for an 8 positon IC switch, and $4.99 for ON/Off switch, and DPDT relays were $6.99. Found out DIdiKey had the same IC 8 position for 29 cents, On/Off was 45 cents, and the DPDT relay was 79 cents. And to think I was getting a awesome deal with 10% off.

[yamiacaveman]

Yep, in the questions and answer part:

Question: can you list ingredients with %. Thank you!
Answer: exact amounts are a trade secret however the MSDS on this states:
Phosphoric acid 10 - 30%
Ammonium dihydrogenorthophosphate 5 - 10%… see more
By GardenTroll on December 28, 2015

This product contains food grade Phosphoric acid.
By Hydro Galaxy SELLER on September 14, 2015