Crystal quartz gravel diamond black

Full disclosure: I have a love/hate relationship with Dennerle. Their products are among the best for price vs longevity, and build quality is to a high standard. However, their replacement parts are overpriced and god help you if you need to contact customer service. But the Germans take their fish-keeping seriously, and this product perfectly exemplifies that. We have a planted aquarium, and needed a black substrate to make the green of the plants really pop and maintain the gorgeous dark color saturation to our L183 Starlight BN and Blue Velvet shrimps. We quickly ran up against what seems to be a wide-spread and persistent problem: finding a black/dark substrate that isn't too sharp for bottom-dwellers (in our case corydoras catfish). We'd tried a number of options, including planting substrates, shrimp substrates, extra fine gravel, and black "sand" -- only to discover that in order to achieve the color without dye, this wasn't technically sand at all, but very finely (and very sharply) ground gravel. Nothing we tried was suitable. Even the largest shrimp substrate, which felt reasonably gentle to the touch, wore down the corys' barbels over time. We were close to admitting defeat and reverting to white sand when we found this product. I'm normally skeptical of gimmicky claims, and the aquarium industry is full of them, but in this case Dennerle have delivered. This gravel is genuinely black, and whatever they've done, appears to be bottom-feeder safe. Two months on and our corys have regrown and maintained their barbels; we also have pygmy corys, variously sized shrimp, otocinclus catfish, and ancistrus using it happily. In my experience, it isn't necessary to rinse this gravel before use; there's no residue to speak of, and barring a couple of grains, it sinks straight to the bottom when poured from the bag. One thing to note if you have a planted tank is that fish waste tends to sit on the top of this product, like sand. This means vacuuming is easier, but fertilizer tabs may become necessary if you notice your plants faltering. Mulm doesn't penetrate the surface as well as with some other substrates.

Love this product. This was my 3rd go at a black substrate - black sand, black resin and finally this. By far and away the best. It was the only one that stayed genuinely black. It was very clean straight out of the bag. Does not float. But most of all my bottom dwelling pigmy corydoras are very happy and their barbels are in excellent form. Plus you can't beat a black substrate for showing off plants and fish though I should add I do not have a planted tank myself so can't say how this substrate performs in that regard.

Really good substrate looks nice and was so clean. Before I add any substrate I will clean it until the water runs clear and I did not even have to run water once. This substrate is really good for planted tanks and I also have Corry fish and they seem happy and have not damaged there fins very happy will buy again if I need more

As good as all the other reviews say, however it’s NOT dark brown! It’s a tan colour. I rinsed it before use although there was no cloudy run off whatsoever. Strangely, white particles started appearing in the gravel after about a month. Anyone have any ideas?

Excellent product, great for my corydoras, does not wear down their barbels

I was looking for a simple substrate to use for a few nano tanks. First of all, this is very clean. I had clear water even though there was no prior rinsing. It looks very good quality in the tank and it is low tech with root tabs added. Plants are growing nicely

I ordered white but it's more of a light grey 10kg did my 4ft aquarium the grains are perfect size for Malawi couldn't be happier with it. Took 5 washes to clean before i put in aquarium.looks great against the ocean rock and the dark blue background.

The best gravel I've ever used, you don't even need to rinse it. I've had three colours of this gravel and they've all been the same. Would recommend anytime, great product!

Ravis de cet achat, J ai mis ce gravier dans un 260 L ( 20 L soit deux sacs) et le gravier est super. D'une part il est effectivement assez lisse et pas saillant --> les poissons ne se blaissent pas. Il est facile à manipuler / lisser / former Et le petit plus c est qu'il n'est vraiment pas nécessaire de le laver ... je l'avais fait donc pour le grand aquarium sans que cela ne colore mon eau de rincage... j'en ai remis dans un 40 L ( pour crevettes) sans le rincer cette fois ci et mon eau n'a pas bougé. A noter tout de même qu'une fois dans l'eau il est plus gris foncé brillant que noir.

かざり砂、兼、低床として使用してます。アクアテラなんで液肥でやってますので綺麗に仕上がってます。良く浮くと聞きますが水洗いしっかりして一晩置いとけば大体沈みますよ。水槽に投入する時も浮く分が少々出てきますが軽く掻き混ぜれば問題なく沈んで一旦沈むと私が使っている分に関したら再度浮いてくる事はないです。

1-2 mm, bra kompromiss mellan sand och grus, kombinerar fördelarna med båda: Vattengenomsläpplighet och smuts kan inte sjunka för djupt ner i underlaget. Den håller för evigt - vilket sätter priset i perspektiv. Den behöver inte ens tvättas före användning.

meme marron foncé il est ....beaucoup trop clair:( vraiment moche:pire mouillée!

Ce l'ho da diversi anni nel fondo di due acquari, è l'unico quarzo che mi piace tra i tanti acquistabili perchè ha un aspetto naturale, non rimane lucido come molti quarzi sintetici di altre marche, le dimesioni dei granelli (2 mm circa) rendono benissimo in vasche da piccole sino ai 60 cm, il prodotto non sembra verniciato in quanto non ho notato nessuna scoloritura o nessun granello non verniciato o verniciato imperfettamente (cosa frequentissima con prodotti di altre marche), e infine arriva piuttosto pulito, non bisognerà passare quarti d'ora a sciacquarne via la polvere. Due minuti in un secchio sotto l'acqua corrente ed è pronto a essere piazzato in acquario. Non è un prodotto economico, l'ho comprato in offerta ma generalmente può costare alche il triplo degli altri a parità di peso. Ma ripeto, la qualità è molto superiore e certamente realizzarlo così comporta un costo maggiore. Inoltre nel prezzo c'è da considerare che è un acquisto una tantum perchè è un prodotto inalterabile e che non si consuma.