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Search: Keyword(s): ; Posts Made By: Marcel G
Forum: Shrimp & Other Invertebrates 05-30-2015, 07:24 AM
Replies: 7
Views: 387
Posted By Marcel G
Today (when I made a water change) I found out...

Today (when I made a water change) I found out that the real cause of death of my shrimp was probably chopping by the pump's propeller rather than high nutrient concentrations (I updated my previous...
Forum: Shrimp & Other Invertebrates 05-29-2015, 05:27 PM
Replies: 7
Views: 387
Posted By Marcel G
I put one Neocaridina davidi var. Sakura into a...

I put one Neocaridina davidi var. Sakura into a tank where I do some growth experiments, and have there the following concentration of nutrients:
→ 90 ppm NO3
→ 60 ppm K
→ 9 ppm PO4
→ 0.9 ppm Fe...
Forum: Fertilizers and Water Parameters 05-29-2015, 05:11 PM
Replies: 2
Views: 193
Posted By Marcel G
The reason why these calculators are down is...

The reason why these calculators are down is this:

Source: https://github.com/flores/yet-another-nutrient-calculator/issues/46

The original calculator was moved here:...
Forum: Fertilizers and Water Parameters 05-26-2015, 12:06 PM
Replies: 6
Views: 284
Posted By Marcel G
1 teaspoon of KHPO4 should be about 6 grams, so...

1 teaspoon of KHPO4 should be about 6 grams, so 1/64 should be about 0.1 g.
Adding 0.1 g into 10g tank (38L) gives you concentration of 1.8 ppm PO4.
I don't say it's safe or not, but I don't know...
Forum: Equipment 05-20-2015, 04:18 AM
Replies: 10
Views: 388
Posted By Marcel G
Cv Calculator

In my first post there's a link to this calculator, and in my second post there's a guide how to use it ... so no need to "Google".
Yes, I know that you can just look at the graphs, BUT not all the...
Forum: Equipment 05-19-2015, 05:38 PM
Replies: 10
Views: 388
Posted By Marcel G
Sorry for the mistake, but the price for Hoke...

Sorry for the mistake, but the price for Hoke 1300 Series is not $70 but $140-150. For $70 you get the Hoke 13** valve with 3░ stem (Cv = 0.024), not with 1░ stem (Cv = 0.010).
I uploaded the...
Forum: Equipment 05-19-2015, 03:11 PM
Replies: 10
Views: 388
Posted By Marcel G
No, so that I can better compare the different...

No, so that I can better compare the different valves (see the picture below).

In case someone is interested, I think I have finally sorted it out:
1) "Cv" is a flow coeficient, which can be...
Forum: Equipment 05-19-2015, 12:02 PM
Replies: 10
Views: 388
Posted By Marcel G
How to calculate flow of CO2 through the needle valve?

I have found out a website (http://generant.com/cvcalc.aspx) where you can calculate the flow (Q) in scfm (standard cubic foot per minute).
But to do that you need to fill in some data first:
1) Cv...
Forum: Equipment 05-16-2015, 04:04 PM
Replies: 7
Views: 339
Posted By Marcel G
Roy (Seattle Aquarist) & oldpunk78, thank you...

Roy (Seattle Aquarist) & oldpunk78, thank you very much for your comment!

A problem is that the output pressure gauge on my cylinder shows "cfh & l/min", not "psi" ... so I don't know what 25-50...
Forum: Equipment 05-16-2015, 01:16 PM
Replies: 7
Views: 339
Posted By Marcel G
I need five valves in total, so ebay is probably...

I need five valves in total, so ebay is probably not the way to go, as it's extremely hard to find 5 pieces together of any particular valve there. Also I know of other (better) valves like:
1)...
Forum: Equipment 05-16-2015, 08:07 AM
Replies: 7
Views: 339
Posted By Marcel G
Needle valve Ideal V52-1: Is it good for fine adjustments?

Hi all,

I would like to buy the Ideal V52-1 needle valve (with Vernier handle for precise adjustments), but I need your help to decide if this valve is suitable for my project.

I have very...
Forum: General Planted Tank Discussion 10-23-2014, 06:35 PM
Replies: 34
Views: 2,315
Posted By Marcel G
Thanks for shedding light!

The "terrestrial fertilizer" I used is called Cererit, which is a fertilizer without any chlorine (8% N, 13% P, 11% K, 2% Mg, 15% S + trace elements like B, Mb, Cu, Zn). This fertilizer is used in a...
Forum: General Planted Tank Discussion 10-23-2014, 08:16 AM
Replies: 34
Views: 2,315
Posted By Marcel G
Attempt to explain my motivation

Joe, I really respect you, and value your opinions.

I understand that my system is seeking equilibrium. Also I understand that ORP is a kind of bulk measurement, and we don't know what species...
Forum: General Planted Tank Discussion 10-23-2014, 07:55 AM
Replies: 34
Views: 2,315
Posted By Marcel G
Science vs. religion

Actually, I'm quite sure I have a lot less money than most people around, but I have a very strong desire/need to understand things going on in my tanks, so that's the reason I put all my spare money...
Forum: General Planted Tank Discussion 10-23-2014, 05:40 AM
Replies: 34
Views: 2,315
Posted By Marcel G
Hi all, first of all, thank you for your...

Hi all,

first of all, thank you for your comments!

Unfortunately, my concern is not to remedy the current situation in my tank (if the tank collapses totally I won't regret), but to understand...
Forum: General Planted Tank Discussion 10-22-2014, 08:06 AM
Replies: 34
Views: 2,315
Posted By Marcel G
Hi Joe, the temperature is somewhere around...

Hi Joe,

the temperature is somewhere around 22░C (72░F), so it's low. The pH is ~5.4, so also very low. I know this environment is not good for microbes. In normal case I won't allow the tank to...
Forum: General Planted Tank Discussion 10-22-2014, 04:25 AM
Replies: 34
Views: 2,315
Posted By Marcel G
Hi Joe, yes, the source of such a high...

Hi Joe,

yes, the source of such a high nitrates is for sure the terrestrial fertilizer which is leaking through the substrate into the water column. I can fix that, but I would like to test this...
Forum: General Planted Tank Discussion 10-21-2014, 07:44 AM
Replies: 34
Views: 2,315
Posted By Marcel G
I would like to resurrect this thread with the...

I would like to resurrect this thread with the following paradox:
I have a very small tank (3G = 12L) with lava stones and akadama as a substrate. I put there (into the substrate) a really big...
Forum: Lighting 10-01-2014, 07:23 AM
Replies: 25
Views: 7,373
Posted By Marcel G
He's not a member of this forum, and he did not...

He's not a member of this forum, and he did not post it yet anywhere, but just sent me his data. He used Apogee MQ-200 PAR meter.
Forum: Lighting 09-30-2014, 11:12 AM
Replies: 25
Views: 7,373
Posted By Marcel G
I have another set of data for ADA Aquasky 451...

I have another set of data for ADA Aquasky 451 (see the attached picture) from Dannyboy77.
http://prirodni-akvarium.cz/img/5_osvetleni/Aquasky_451.jpg

All data are in μmol/s.m2.
Forum: Lighting 09-29-2014, 02:04 PM
Replies: 172
Views: 33,092
Posted By Marcel G
http://prirodni-akvarium.cz/ → czech version (use...

http://prirodni-akvarium.cz/ → czech version (use Google Translate)
http://prirodni-akvarium.cz/en/ → english version (not updated as much as the czech version, because only about 5% of users...
Forum: Lighting 09-29-2014, 11:59 AM
Replies: 172
Views: 33,092
Posted By Marcel G
Questioning the results from calibrated Apogee MQ-200 PAR meter

All the measurements on my site (http://prirodni-akvarium.cz/index.php?id=mereni) were made by calibrated Apogee MQ-200 PAR meter [PS: You can use Google Translate]. Also all the data are clearly...
Forum: Algae 09-12-2014, 02:31 PM
Replies: 19
Views: 7,475
Posted By Marcel G
GDA = Chloroccocum

Here are some macro- as well as micro- pictures of the green dust algae on my tank's glass:

Macro pictures:
http://prirodni-akvarium.cz/img/7_rasy/rasy_atlas_Chlorococcum_makro_2.jpg
...
Forum: Lighting 06-22-2014, 08:04 AM
Replies: 25
Views: 7,373
Posted By Marcel G
In case of ADA Aquasky I would disagree with this...

In case of ADA Aquasky I would disagree with this statement, because as I saw a few tanks with this light, all seemed to have problems with algae. Light intensity of 150 Ámol PAR at the substrate is...
Forum: Lighting 06-20-2014, 06:34 AM
Replies: 25
Views: 7,373
Posted By Marcel G
DIY Aquasky

I would like to use LED strips with SMD 5630 or 5730 diodes (one meter of this LED strip with SMD 5630 chips should have 60pcs of diodes), as these are the brighest ones that are widely available. I...
Showing results 1 to 25 of 28

 
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