I've recently had some algae cling to the walls of my aquarium. I bought some "algaefix" which claims it is safe for fish and plants although my danios and now swordtails are laying on the bottom roughly 15 minutes after adding it to my tank. The fish seem awake and aware but are very still until provoked. Then they'll swim/act normally. Any advice? Anyone used "algaefix" from api before?
I know I added the correct ammount, it said to add 1 tsp to every 50g. I have a 55g tank and added 1 tsp.