Seashells for PH adjustment?

  • We are currently upgrading MFK. thanks! -neo

SCGeordie

Feeder Fish
MFK Member
Nov 2, 2010
340
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Simpsonville, SC
I have 5 tanks plus a 'hospital' tank running (1x6g, 3x10g, 1x40B and 1x46g Bow).
Water from the tap is 'soft' (sorry forgot the numbers) Ph neutral (7.0) every time with trace ammonia (<0.25ppm), 0ppm Nitrites and 0ppm Nitrates.
Every tank has diferent substrate - gravel, gravel/caribsea mix, sand, sand/carib mix, carib and bare bottom, yet with every tank within 3 or 4 days Ph has dropped to 6 (or below). The 6g tank runs fine without WC as it gets topped up every other day to account for evaporation (1 quart), the 46g has been running smoothly for a couple of months with weekly 30% WC (fish happy and healthy) but one of the 10g's is causing some concern - it's housing 8 female Endlers livebearers and fry (fry are moved out to another 10g when they reach a couple of weeks old). Tank crashed last week and I had to change out the filter (now has a Topfin 20g hob with all bio and padding) so is cycling again (using Prime to protect fish) but the Ph dropped to 6 (possibly lower) within 2 days and now the Endlers are staying huddled together in a corner and hardly eating whereas before they would race to the top for food every time I went near the tank. I've heard that livebearers are more sensitive to low Ph and am thinking that is the reason they are like this (sustained low Ph over a couple of months now). I tried adding sodium bicarb (1/4 tsp at a time) with no change, also tried API's Ph Up (1/8 tsp at a time) with no apparent change unless the Ph was even lower than I tested.
Have no lfs (only Petsmart and Petco) other than 2 that deal only in marine so nowhere to get crushed coral. Petsmart girl (actually one that is knowledgeable) suggested I get some seashells from Hobby Lobby and put them in the tank(s) to bring the Ph back up.
Questions :
1. How effective are seashells to raise the Ph and should I crush them up and add them in a filter sock or something?
2. What is the relationship between Ph and Ammonia/Ammonium toxicity?
3. Any other suggestions?

Sorry this is so long and thanks for reading!
 
I have seen the same PH crash with my western Washington soft water. It starts around neutral PH, but after a week will reed ~6.2 or so. What another local (Knifegill) MFK'r gave me to try is a bag full of crushed coral. This works better than shells as it is softer and dissolves more readily than the shells do IMO.

Knifegill's explaination its that the initial from tap spike is due to the plumbing leaching into the water and raising the PH, then it would slowly disipate in our tanks-ending at the actual PH of around 6.2. I heard another reason lately that sounded better, but I forget...All I know is the coral works. I was reading 7.0 in ALL my tanks when I used the coral fragments, and it holds between water changes, I have a mesh bag full of the coral in my sump on one tank, the other has it mixed in with the substrate, it doesn;t take much, but I know that hardness is being raised for sure, as my trapdoor snails I also have-their shells look fantastic and are very strong, which wasn't the case before the coral.

On a salt water not, I have seen local office fishkeepers use big seashells in tanks, again to raise and keep higher than tap PH. It works for sure, you just need to get some...Check Ebay too.
 
I have a 150g (UK) which was fine with a PH of 7.2 for months, then it went down to 5.5 over w few weeks, all i did was use 2kg of coarse crushed coral added to the sump and it raised it back to 7.2, i added it in two halfs to raise it slowly, now even after a WC straight from tap its stable at 7.2.

I did this after advice on here to use crushed coral instead of shells etc as said above it realeses better.

good luck mate

wayne
 
Thanks Racer and Wayne, gonna try one of the saltwater lfs' when I get out of work (hope they're still open) and see if they have crushed coral.
 
So, couldn't get any crushed coral so settled for Seachem 'Neutral Regulator' to buy some time.
When I got home the 'problem' tank was reading 6.4 and some of the Endlers were more active than yesterday which at least seems to proove my suspicions correct that the low Ph was having bad effects on them so I dosed my Endler tanks and hospital tank with the Neutral Regulator tonight and will add it to my WC on the other tanks this weekend. It's supposed to keep Ph stable at 7.0 for a month per dose so I'll see how it performs, $8 for enough to treat all my tanks for about 4 months isn't too much to pay if it works.
 
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