Koi Fish

Thanks @Daniel & @Streetwise good information.

Hi Daniel, How often do you do water changes on your livingroom tank? I’m thinking of taking out my one sponge filter in my 40 gallon tank. Its a sand substrate moderately planted. Do you worry about nitrates & debris build up with no filter? cheers

I’m no expert. Maybe do a search on Allelopathy / Diana Walstad. From Diana Walstads Book. ”Aquatic plants contain a variety of allelochemicals whose primary function is to protect the plant from being eaten by fish and insects or being destroyed by disease” I’m not sure if this would be the case with your Red Tiger Lotus.

This should help.