API Aquarium Water Care

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New Pet
Master Aquatic Plant Care: Lush Aquarium Plants & Happy Fish
Tanks with live plants can be excellent additions to your home, bringing a touch of nature indoors. Learn how to take care of aquatic plants.
Updated on November 13th, 2025
New Pet
Mastering Koi Care: Optimal Tank, Food, Water Quality & Health Tips
Learn how to care for a Koi, recommended diet and aquarium setup. Find Koi for sale, supplies and equipment at your neighborhood Petco.
Updated on November 13th, 2025
Home & Habitat
Your First Fish Tank: Easy Setup Guide for a Thriving Aquarium
Everything you need to know about how to start a fish tank. Learn about setting up an aquarium, choosing the right type, and acclimating new fish to your tank.
Updated on November 13th, 2025
New Pet
Freshwater Aquarium Setup: A Step-by-Step Guide for Beginners
Learn how to set up a freshwater fish tank and key considerations regarding placement, supplies needed, and the set up process.
Updated on November 13th, 2025
New Pet
Butterfly Fish Care: Tank Setup, Feeding, & Water Quality Guide
Learn how to care for Butterfly fish recommended diet and tank setup. Find the right food, supplies and equipment at your neighborhood Petco.
Updated on November 13th, 2025
Health & Wellbeing
hi! I have gold fish in a tank and after doing a 20% water change my fish seems to be in shock just sitting at the bottom of the tank... could it be the PH level change? please help me!
It may be the pH change or other change in water chemistry. Use a home test kit to check water quality. Make adjustments as indicated. It may also be a response to a temperature change. Check water temperature and increase the heat if necessary, just don't forget to turn it down or off once the temp is within range.
Updated on August 12th, 2025
Health & Wellbeing
We recently had two 5+ yr old plecos, 2 5+ yr old glofish, and a year old koi get cloudy eyes suddenly. 9 hrs later the plecos and koi died while 1 glofish died 2 days later and the other is alive, but not doing well. The plecos also had sunken eyes
Thanks for reaching out about Diesel. This surely points to water quality issues. Have you tested the ammonia, nitrites and nitrates? Any chance of copper in the system? Parasites and bacteria rarely cause death this quickly. Remove all fish and place in new tanks, with spring water (bottled or reverse osmosis). Change or add carbon filtration. Good luck.
Updated on August 12th, 2025
Health & Wellbeing
Concerned about what possible skin diseases?? Some of my fish possibly may have. Is it a possibility that some just algae on them. I recently treated the tank with copper sulfate because I believed that fish may have velvet.. however two days later;
Thanks for reaching out. Have you tested water quality for pH, ammonia, nitrite and nitrate. Correct problems. Don't see any signs of external lesion on the pictures, except fine erosion, and possible gravid fish. A veterinary visit is probably needed to trouble shoot for disease. Randomly adding chemicals to the water could have detrimental effects. Good luck.
Updated on August 12th, 2025
Health & Wellbeing
There are bubbles on the surface of the way terms and it is losing its feathers
Thanks for reaching out about your fish and including photos. Water quality needs to be checked (pH, ammonia, nitrites and nitrates) and corrected. Often high protein lead to increased surface tension of the water and the bubbles accumulating. This can also damage the skin and fins. Good luck.
Updated on August 12th, 2025
Health & Wellbeing
I just got home from PetSmart to have my water tested and they said it was safe to transfer my fish into my new 29g with better filtration. But when I put them in there, I noticed they have red/lilac gills, signs of ammonia poisoning, and I'm thinkin
Hi, You will need to test for ammonia, nitrite and nitrates now that there are fish in the new tank. If the biofilter is not well established in the new tank, then the abrupt presence of fish will cause an ammonia spike. You should do a partial water change, ensure proper aeration of the water. There are products you can get to boost the biofilter if this is in fact the issue. You should also consider the number of fish for the just meet of gallons in the tank as overcrowding may be a contributing factor. If you need further guidance, please don’t hesitate to request a consult. Good luck!
Updated on August 12th, 2025

API Aquarium Water Care

API Stress Coat Aquarium Water Conditioner

API Tap Water Conditioner

API Stress Zyme

API Quick Start

API Freshwater Master Test Kit

API Accu-Clear

API 5-IN-1 TEST STRIPS Freshwater and Saltwater Aquarium Test Strips

API QUICK START Freshwater and Saltwater Aquarium Nitrifying Bacteria

API Ammo Lock

API Aquarium Salt

API pH DOWN Freshwater Aquarium Water pH Reducing Solution

API Freshwater/Saltwater Ammonia Test Kit

API Protect Goldfish

API PondCare AlgaeFix

API Saltwater Master Test Kit

API PondCare Accu-Clear Pond Clarifier

API Aquarium Tap Water Conditioner

API Freshwater Deluxe pH Test Kit

API pH UP Freshwater Aquarium Water pH Raising Solution

API Goldfish Aquarium Cleaner

API Reef Master Test Kit

API Simply-Clear Bacterial Pond Clarifier

API Water Softener Pillow

API PondCare Stress Coat Freshwater Conditioner

API Freshwater pH Test Kit

API Betta Water Conditioner

API Algaefix

API PondCare Pond-Zyme Sludge Destroyer

API PondCare Pond Salt

API PondCare Chlorine & Heavy Metal Neutralizer

API AlgaeFix Marine Aquarium Algaecide

API PondCare Microbial Algae Clean Pond Algae Remover

API Nitrate Test Kit for Freshwater/Saltwater Aquariums

API AMMO-LOCK Freshwater and Saltwater Aquarium Ammonia Detoxifier

API Stress Coat Plus

API Pond Stress Coat

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