Dead And Sick Guppes.. Need Help!

prag16

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First of all, I know I made several mistakes, after doing some research, but I'm hoping it's not too late. This is gonna be sort of long, but I want to get all the info out there.

In early December I set up my first aquarium. It is 25 gallons. I did not cycle it prior to adding fish. I set it up with gravel substrate 1" thick at the bottom, and a bunch of decorations. Plastic plants and props, and one rock that I think is limestone.

I added two fancy guppies (1 male, 1 pregnant female) and three "painted" tetras.

All my levels were fine for the first couple weeks. 0 nitrate, nitrite; almost zero ammonia, pH 6.5 (maybe a little low; more on that later), KH 60, GH 120. However both guppies started to look like they had sort of like mold growing on them; they looked sort of dirty (might be a better description) on their faces, mouth, back, and head. However they showed NO other ill effects, they happily played and swam and ate, and the tetras were fine.

Three weeks after I set it up (three weeks ago now) the female had fry. There were probably more than 20 of them (that I saw). At my wife's assistance, we "saved" 16 of them and have them in a 'baby saver' breeding net inside the tank. I have no secondary tank.

At some point after this, I seemed to notice a few different issues developing. KH was down to more like 40, GH was up over 180 (the highest my test strip registers), pH now down to more like 6.2 or 6.3. The biggest problem though was ammonia levels. Don't remember the ppm, but it showed up in the "stress" category on my testing kit. Also, some brown algae looking spots have been appearing on the gravel, plants, glass, and ornaments.

About a week ago my female guppy stopped eating, and layed around at the bottom. When she actually did swim, it was all cockeyed. She died a couple days later. The male was absolutely fine through all this (except for the aforementioned dirtyness or moldiness), though his gills may have been just a tiny bit red (from the ammonia?).

(I later found out that this was probably NOT a good idea) My wife and I were very upset. We went out and got some more fish (we had planned on adding some anyway). We got two female guppies, three red-eye tetras, and one red tail black shark. I know this is too many at once, but we were ignorant; didn't start doing much research until this week.

In the few days since we added these fish, the ammonia levels are still high, now near the "danger" zone of the test kit. Since before the original guppy died, AmmoniaSafe did nothing whatsoever; it just sort of clumped up and fell to the bottom. I got tablets also that were supposed to dissolve and neutralize ammonia; no effect. Did 30% water change every day for five or six days straight: no change.

Right now, one of the new females is now starting to hover near the bottom a lot. It may just be because she's very pregnant; she still swims around on occasion, and comes to the top to eat. BOTH new females had clear skin/scales when I got them. Now BOTH of them look sort of dirty/moldy like the old ones; the more pregnant of the two showing more extreme signs.

Every other fish in the tank seems happy. The shark is really cool; he's even been nibbling at the brown algae. He has established a little greek ruins prop as his territory and stands guard with quick patrols of the tank at regular intervals. The six tetras all get along and I've seen some schooling behavior here and there. The other two guppies look fine (except for the 'dirtyness').

The babies seem to be growing quite slowly; I've been feeding them mostly crushed flakes a few times a day. I'm afraid they're being stunted by the confines of the breeder net... but they're still far too small to have in the general population.

Sorry for the long winded account; hopefully somebody will read it

Main questions are about the ammonia control, mold or dirt on guppies (ONLY the guppies are affected by this), and seemingly slow guppy fry growth.

I'll provide as much more specific info as needed if anybody has any ideas. Thanks!!
 
I need to check the limestone out as it can alter ph. So I would remove it for now.

Ph can be all over the place in a cycling tank.
Check ph in tap water.

Do you have liquid test kits?

Immediate water change and increase aeration.

Red gills can be due to bad water quality.
The mold is it black. Black patches can be ammonia burns that are healing.
Brown algae common in newly set up tanks, It should disappear as the tank matured.

Don't add anymore fish till the tanks cycled.
Also what type of shark is it. As there no sharks that can go in a 25 gallon tank.

Limestone raises ph in a fish tank.

Also you need to read up on the nitrogen cycle.

http://www.fishforums.net/index.php?/topic/277264-beginners-resource-center/
 
Okay, I checked and it actually is not limestone. It's something more jagged and crumbly.

The shark is a red tail black shark. From what I've been reading, that is the type of shark with the smallest tank requirements, and he'd be fine in a 25g tank. So far he's gotten along with the other fish other than occasionally chasing them away from a greek ruins prop that he seems to have established as his 'territory'.

The 'mold' is black I think; dark gray/brown at least, maybe black. I'll try to post a pic later on. I'm not sure about the healing ammonia burn theory because there were no other adverse signs before the 'mold' started to appear. On the guppy that I've had for longer, it's sort of greenish in spots. But he looks fine otherwise.

I certainly won't be adding any more fish for the time being, especially since the guppy fry will presumably grow up eventually.

I don't have liquid test kits; only the strips right now. I'll pick up a liquid kit when i have the chance.

Is a daily 50% water change for the next few days a good idea, or would I be just masking the problem?
 
Ok.
Red tailed sharks really need at least 40 gallons.
Also keep an eye on him with other fish, as he will go after or even kill smaller fish.
 
Ok.
Red tailed sharks really need at least 40 gallons.
Also keep an eye on him with other fish, as he will go after or even kill smaller fish.

He's a baby right now, 2 or 2.5 inches. He's been fine with the other fish thus far. All he's done is chase them away from his hiding place if they come near or come in. Other than that when he patrols around the tank there's been no hostility. Part of the reason may be that he's not a whole lot bigger than the other fish for the time being, though I know that will change in the future. However even when a couple guppy fry escaped the breeding net, he didn't try to go after them. He let them move right through. The tetras on the other hand were falling all over each other trying to eat the fry, and they eventually succeeded before I could net them out.

Anyway, shows what use pet stores are. Two separate people at separate stores told me that rainbow sharks and black tail sharks were fine in 20g community tanks, and at worst might try to eat guppy babies. Shows how good they are.

He'll be small for the time being, and over the next few years as he grows I could look into getting a bigger tank. We'll see.

As for the ammonia issue, I did an 80% water change last night and got the level down from a little over to 1ppm to just under .5ppm. Will probably do another smaller percentage water change tonight.
 
Ok.
Keep us all updated if you don't mind.

The best advice I can offer you is to research fish before you buy. Tank size, and also make sure they can be kept, and live peacefully with the fish you keep.
 

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