Just don't stock the fish tank beyond what the filtration can support. It is often a temptation to add more creatures to the water.
Gwen Lynn wrote:
Good point, TC! Goldfish in particular are known for creating higher ammonia levels than other types of fish, because they produce more waste. It's best to keep goldfish only with goldfish, especially in aquariums.
Instead of aluminum foil, you might pick up one of those cheap thin mylar emergency blankets from the camping section of most any department stores. It is much more reflective and less costly than the foil.
I've even made sort of curtains out of it for hydroponics before.
And think about how much crazy money people spend on sheets of mylar film at the Hydroponics shops
The emergency blankets make a goo easy reflector.
I even found that I could make a kind of curtain out of them for it to be easy to pull out of the way.
Some of those blankets are thinner than others and can work more like window tinting rather than blocking all sight, this was kinda nice around the Hydroponics when I didn't want the whole room lit up bright but it was still nice to kinda see what was going on with my lettuce.