Originally Posted by Isabella

You don't have to clean the inside of your tank glass at all if you don't want to. People usually clean their glass when it becomes dirty with algae (if they don't have algae eaters to clean the glass). If you have effective algae eaters, you don't need to clean the glass either as they do the job for you.

I see you have the following fish in your 40 gallon tank: 1 black moor goldfish, 1 yukon goldfish, 2 bala sharks, 4 blackskirt tetras, 2 angelfish, 1 dwarf gram, 2 zebra danios, 1 pluck. (From the link in your signature) Is that right?

Just a comment about Goldfish: They're not exactly good tankmates for any tropical freshwater fish because they like to be in cooler water, while all tropical fish like warm water.

Also, Gouramis don't mix well with Angelfish either.

Besids, with 2 Goldfish and 2 Bala Sharks alone, your tank is VERY overstocked! Bala Sharks need a tank around at least 120 gallons. Not to mention the rest of fish.

Sorry for the bad news

Anyway, if you're getting a lot of algae, the best solution is to get an algae eater. You could get either of the 3 species for a 40 gallon tank: a bunch of Otos, Bristlenose Pleco, or the True Siamese Flying Fox. But, I wouldn't recommend getting any more fish for your tank as it is already overstocked.

P.S. If the list of your fish in the link is wrong, and the one given in your signature is right, then I am sorry for all the comments

Originally Posted by Isabella

In that case, your 40 gallon tank is not overstocked What happened to the other Angelfish, Bala Sharks, and Goldfish? Anyway, if your tank glass is clean, then you don't need an algae eater at all (unless you have live plants covered in algae). If, however, you still want an algae eater, then you still have space for it considering your current stocking level. You could get either of the three: 1 Bristlenose Pleco, 1 Siamese Flying Fox (the true one), or a couple of Otos. If you get Otos, make sure your water is very clean at all times. If you don't want any algae eater(s) now, don't get any, but leave some space for them in case you start getting algae in the future (which you most likely will). Unless, you'll be cleaning the glass yourself, or unless you're OK with algae. Some algae types, such as green algae, can even look attractive in a tank

Originally Posted by giordanopg

The Angelfish died 4 days ago
I returned the goldfish and the sharks to the LFS a couple of weeks ago.