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How long should a heater take to heat up a tank ?

I currently have two peacock bass (Cichla Ocellaris) they’re 3 inches each and my heater just broke. It’s a 75 gallon tank and the temperature is at a constant 72 degrees Fahrenheit right now. Will they be okay till I am able to get a new heater?

My old ATI? sponge prefilters & their lesser replacements clog too easily. They had multiple adapter options to fit many filter intakes. I can't find them now.

I have duckweed (lots!) in 2 tanks, & BBA in 1. I want to get to a once/week cleaning if I can. I'm not dealing with either very well. I do not want to have to rinse/clean them more than that. I scoop...

So I finally got my water softener fixed, it hasn't worked in a couple years maybe. Anyway I was wondering if anyone else is using a softener and if so do you bypass the softener for tank water?

I mix RO with my tap water to get the right hardness, and ph. I am using the softened water now, since the thing is working..

I might add a deionizer unit i...

Anyone giving away a fish tank please ?