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I had 2 pairs of Aphanius mento killifish in with 6 small shelldwellers in a 29 g tank. Everything seemed to be okay. I change 1/3 - 1/2 of the water every week, plants look healthy etc. The Aphanius males turned blue, almost overnight. They're beautiful but they chase the females (and each...

Suddenly some bits of white stuff appeared on the water surface in my aquarium. They look and feel (when I crush them) exactly like Perlite, those white bits they put into houseplant potting soil. They are mostly in the corners or around the glass but there are a few floating freely. Ideas...

I have a lot of algae in my 29 gallon tank. I have 6 shelldwellers, 4 small killifish, 1 pleco and 2 nerite snails. The pleco and snails can't keep up with algae, especially the algae growing on the shells and plants. I scrub the glass every week when I change water and every few days, when I...

I know that I had too much light in the tank, for various reasons (the LFS said that the dwarf water lettuce needed a lot of light) but I have learned my lesson now. How do I get rid of the nasty stuff that is already there? There is the thick, light green fuzzy looking stuff. It scrapes off...

I have a wooden canopy over the tank. There are spaces between the slats of wood; I don't know the brand because I bought the whole setup secondhand. Yesterday, one of the danios disappeared and I looked in the bottom of the tank and couldn't find it; I don't see anything on the floor beside...

I bought a few pieces of holey rock and some empty large barnacle shells (some are attached to stones) for my soon-to-be shell dweller tank. After they soaked for a while in plain well water (hard and alkaline), I looked at the rock and there were softer, crumbly bits inside the holes that I...

I have a tiny planted tank (3.5 gallons) with a betta and a mystery snail. They were both doing really well until I had a disaster a few weeks ago, when the substrate got covered in white stuff that looked like mold and the water was really cloudy. I posted about it here. After a major water...

My 29 gallon tank is cycled and planted, and it looks like one of the plants had a stowaway, because one pond snail became dozens and dozens in a few weeks. I've spent hours reading about how to get rid of them. I tried putting a lettuce leaf into the tank. The next morning, it was still...

I am going to change my small (29g) tank - it's planted and I want to move the plants to one side so that the other side can have all sand for multies. What is the best way to do it? The tank has 5 danios. Should I take them out and put them in a bowl while redecorating? How much of the...

My tank is finally cycled and I'm ready to add fish. I am surprised at how hard it is to choose! It is 29 gallons, my water is very hard and pH 8.2. It's planted and one of the plants must have brought in pond snails because I keep taking them out but more appear. Algae is starting to grow...

Hi, this has probably been posted hundreds of times but I don't know where to start with these 2 problems. I started with a Betta who looked lonely on the counter at the local Asian supermarket. He is in a 3.5 gallon tank (a kit from Petsmart) that comes with LED lights and small filter. I...