2 filters but overstocked

[16gallontanker]

I recently bought a 2 dual sponge filters 1 rated for up to 65 gallons and 1 rated for 30 with bio balls and my tank has some plants too .I have 15 total corys 3 different species. I have 3 otocinclus catfish I have around 10 dalmatian mollies juvenile and 1 betta female .so my question is do yall think the 2 filters and the plants are enough for this bio load? I only feed my fish 1 time a day by the way it's a 20 gallon standard tank

 

[gwand]

Probably, but check your nitrate level to know for certain.

 

[16gallontanker]

Ok

 

[GaryE]

I suspect you may be making a common mistake - seeing your tank through a test kit. Is your tank overstocked? It depends on what that word means to you. You may get good readings and have a tank that's brutally overcrowded.

Dalmation mollies grow relatively large, and today's juveniles are tomorrow's adults. They grow fast, and their size today is meaningless for stocking. They graze on surfaces, and that can include the skin surface of Bettas if they become bored with no space. They're restless active fish. I love mollies, but 4 or 5 in a 20 gallon with no other fish would be my maximum stocking, if I had good plant growth, hard water and weekly partial changes.

Bear in mind that sponge filters take a few weeks to become effective as bio-filters.

 

[MaloK]

How old is your setup ?

It's quite overstocked, like 150% and water changes should be around 75% per week or 50% every 3 days.

 

[16gallontanker]

I removed all my mollies from the tank and put them in a ten gallon till I can get rid of them or something because I'm tired of them eating almost all My corys food and reproducing too much. I think that's why my corys are not growing.